Poor gas mileage

[Ramfancy]

Make sure you are running the right air pressure. That can affect the mpg. Also, unless you’re running the stock size highway tires, you’ll lose a mile or more. Winter gas is a mile off compared to summer gas in my area. The 3.21 seem to make a mile or more on the highway. If your payload is way closer to 1000 than 2000, you have a very heavy truck and that will be another mile or more off mpg. All truck manufacturers use mileage makers for their sticker numbers……

I get 21-22 mpg on the highway in the summer, but I have a light truck with mileage gears and stock boring highway tires. I’ll be replacing the tires at some point with the same size highway tires but they will be heavy lt tires for better towing. I will expect to lose at least 2 mpg just from heavier tires. My last ram did as well.

 

[BowDown]

Like I said, EVERY ONE of these trucks get different numbers. Anyone that thinks that these trucks, if driven by the same driver, in identical conditions on the same day, will get the same MPG is plain and simple wrong.
These are machines with a tremendous number of parts, electronic and mechanical, that are manufactured under varying condition from day to day, with other machines that have a wear cycle so need to have parts replaced or repaired, by humans that have differing levels of "give a $h!t", that are put in a box and sent to other humans with the same attitude, and assembled into differing levels of completeness, and sent on down the line with sometimes missing and or misaligned parts, or electronic part that may or may not be PERFECT or programed properly by software that may or may not work properly for the duration of the vehicles life, AND all or some of these components and assembly by countries that really don't like us or give a **** whether we have a nice day or not.
No two identically built and optioned vehicles, straight from the factory, if driven side by side, will get the same numbers. There are just too many variables in the vehicle parts and manufacturing, let alone the human, and importantly, environmental, conditions.
I am just tickled to death that you got one of the good ones. I was also lucky, but other are not so fortunate.
So, I respectfully disagree with you.

These are for the most part robot assembled trucks with little variance in the programming or mechanicals.
The biggest variable is the driver, not the truck; the limited and longhorns are arguably the heaviest of these trucks and I've seen owners repeatedly achieving good numbers and if those 2 can, then all should be capable of the same.

The no 2 vehicle claim, I completely disagree with,; that is the entire point of robotic assembly lines.
Now, could there be some problem with the trucks or not achieving this? Certainly but to say no two trucks can get similar mileage, that's completely false (IMO) or that these trucks regularly don't achieve this mileage also completely false also IMO.

The only definitive way to determine the difference between the trucks is likely going to be to put them on a chassis dynamometer and see if they're making the same power and what the fuel consumption is making those power; ergo measuring parasitic loss or drag in the driveline.
I have no doubt that I could get in another similarly equipped truck and drive my normal style that I could achieve the same mileage that I get in my truck. Too many other people are achieving the advertised mpg.

In my opinion, tires may be the only true variable in this situation specific to the trucks aside from the obvious rear gear ratio.
I know tires can play a large role, my car has a 12 rear wheel horsepower difference using street tires versus drag radials

 

[BowDown]

Make sure you are running the right air pressure. That can affect the mpg. Also, unless you’re running the stock size highway tires, you’ll lose a mile or more. Winter gas is a mile off compared to summer gas in my area. The 3.21 seem to make a mile or more on the highway. If your payload is way closer to 1000 than 2000, you have a very heavy truck and that will be another mile or more off mpg. All truck manufacturers use mileage makers for their sticker numbers……

I get 21-22 mpg on the highway in the summer, but I have a light truck with mileage gears and stock boring highway tires. I’ll be replacing the tires at some point with the same size highway tires but they will be heavy lt tires for better towing. I will expect to lose at least 2 mpg just from heavier tires. My last ram did as well.

Exactly.
I have my tires aired up to 38 PSI both front and rear. I also see a drop in miles per gallon and the winner however I attribute this to colder denser air and the ECM needing to add more fuel to stay within the program parameters for AFR.
I say this because even on winter gas, the days where the temperature gets into the 70s like it has been this week in dallas, my fuel mileage jumps back up to mid to high 17s in mixed city driving.

I will say this, as much as I dislike the performance of the factory Goodyear touring tires, I achieved my best fuel mileage with those tires. Regularly getting 18 to 19 in the city and 23 to 24 on the highway. When I switched the pirelli scorpion as plus 3 tires I lost about 1 to 1.3 miles per gallon.
I haven't looked to see how much lighter or harder the Goodyear tires are over these tires but there's definitely a fuel mileage difference so you're 100% correct that tires will change your mileage.

 

[BowDown]

I just pulled a trencher on a trailer around going 65 mph and my instant was 17 to 19. Didn’t use toe haul mode either.

I've observed the same pulling a U-Haul trailer loaded with 2 tons of stone. For me, tow/ haul delays up shifts unnecessarily too long. Shift should be based on MAP and throttle position, not speed.

The only time I use tow haul is when I'm in a braking situation while towing, then I hit the switch and engage it to utilize etorq and engine braking

 

[Upupandaway]

I just pulled a trencher on a trailer around going 65 mph and my instant was 17 to 19. Didn’t use toe haul mode either.

that's wild. Happy for you!

Make sure you are running the right air pressure. That can affect the mpg. Also, unless you’re running the stock size highway tires, you’ll lose a mile or more. Winter gas is a mile off compared to summer gas in my area. The 3.21 seem to make a mile or more on the highway. If your payload is way closer to 1000 than 2000, you have a very heavy truck and that will be another mile or more off mpg. All truck manufacturers use mileage makers for their sticker numbers……

I get 21-22 mpg on the highway in the summer, but I have a light truck with mileage gears and stock boring highway tires. I’ll be replacing the tires at some point with the same size highway tires but they will be heavy lt tires for better towing. I will expect to lose at least 2 mpg just from heavier tires. My last ram did as well.

I've got the psi set at the door sticker! Ya, I looked into some threads on winter gas across a bunch of forums, as well as the temperatures effect on mileage, and figure about a loss of 2mpg, which would get me up to 13mpg. Yay, only 9 more mpg to go lol!

These are for the most part robot assembled trucks with little variance in the programming or mechanicals.
The biggest variable is the driver, not the truck; the limited and longhorns are arguably the heaviest of these trucks and I've seen owners repeatedly achieving good numbers and if those 2 can, then all should be capable of the same.

The no 2 vehicle claim, I completely disagree with,; that is the entire point of robotic assembly lines.
Now, could there be some problem with the trucks or not achieving this? Certainly but to say no two trucks can get similar mileage, that's completely false (IMO) or that these trucks regularly don't achieve this mileage also completely false also IMO.

The only definitive way to determine the difference between the trucks is likely going to be to put them on a chassis dynamometer and see if they're making the same power and what the fuel consumption is making those power; ergo measuring parasitic loss or drag in the driveline.
I have no doubt that I could get in another similarly equipped truck and drive my normal style that I could achieve the same mileage that I get in my truck. Too many other people are achieving the advertised mpg.

It seems that by saying the trucks have little to no variance, you're implying that this can only be chalked up to driver input, which is quite a stretch! Absolutely no doubt a heavy Limited will do worse than a lighter Big Horn for example, I don't believe anyone is disputing that. However, there are certainly variances between trucks in the same trim and options, which I do not currently have an answer for - I'm proof of that along with a few others in this thread.

I am a grandpa driver - I baby my truck, I drive slow for a softer ride and avoid any bumps/cracks in the road that I can.. I'm not oblivious to my driving style, and on the cluster screen I always have my fuel economy showing because when I drive I almost treat it like a game trying to get the best mpg possible. There are other Limited's in this thread getting 30%+ better economy than mine, so it does negate your theory that all trucks are the same.

 

[Upupandaway]

I've observed the same pulling a U-Haul trailer loaded with 2 tons of stone. For me, tow/ haul delays up shifts unnecessarily too long. Shift should be based on MAP and throttle position, not speed.

The only time I use tow haul is when I'm in a braking situation while towing, then I hit the switch and engage it to utilize etorq and engine braking

There ya go! Exact same spec'd trucks and you get the same mileage as me but pulling 2 tons on a trailer

 

[Ramroo]

I just pulled a trencher on a trailer around going 65 mph and my instant was 17 to 19. Didn’t use toe haul mode either.

And you laid some pipe

 

[JBNCCCB]

I disagree, I regularly achieve the claiming MPGs in my truck, its the driver or the drivers driving habits more than anything else. I'd bet that those that think they are driving conservatively really aren't.
Im averaging 17-17.5 in mixed driving right now and do this consistently tank after tank in the winter. When it warms up and the air is less dense, I can get 17.5-18 in mixed driving mainly city. On the highway, in the winter, I see 20-21 mpg at 72-73 mph, in the summer, I see 21-23 mpg at 73-75 mph. If I drop below 70 mph on the highway, my mpg tanks to the 17's, best mpg on the highway for me is around 1700 rpm in 8th gear. Best mpg in the city is around 45-50 mph in 7th gear, also 1600-1700 rpm. When I try to drive in that rpm range, i achieve the above stated mpg's easily.

My Rebel has the paddle shifters and here has been my observation. I've made 4 in town trips for a total of about 30 miles. I've achieved 17mpg average.
Here is what I did.
Sport Mode then select 2wd.
Manually shift the transmission with either paddles or gear shifter. Target all shifts around 2200 rpm.
Target <2000 (1500 is ideal) rpm for driving constant speeds.
Burning 87 octane.

 

[BowDown]

that's wild. Happy for you!

I've got the psi set at the door sticker! Ya, I looked into some threads on winter gas across a bunch of forums, as well as the temperatures effect on mileage, and figure about a loss of 2mpg, which would get me up to 13mpg. Yay, only 9 more mpg to go lol!


It seems that by saying the trucks have little to no variance, you're implying that this can only be chalked up to driver input, which is quite a stretch! Absolutely no doubt a heavy Limited will do worse than a lighter Big Horn for example, I don't believe anyone is disputing that. However, there are certainly variances between trucks in the same trim and options, which I do not currently have an answer for - I'm proof of that along with a few others in this thread.

I am a grandpa driver - I baby my truck, I drive slow for a softer ride and avoid any bumps/cracks in the road that I can.. I'm not oblivious to my driving style, and on the cluster screen I always have my fuel economy showing because when I drive I almost treat it like a game trying to get the best mpg possible. There are other Limited's in this thread getting 30%+ better economy than mine, so it does negate your theory that all trucks are the same.

Yet you have heavier limiteds and longhorns getting 17/18 and 22/23 mpg. Seems logical to conclude that the drivers style a driving is severely affecting the fuel mileage of these trucks

 

[BowDown]

There ya go! Exact same spec'd trucks and you get the same mileage as me but pulling 2 tons on a trailer

Read that again, I said nothing of mileage. I spoke to the the way tow haul works. That said, I did get 16 17 miles per gallon driving 65 towing that load staying in 7th gear

 

[BowDown]

My Rebel has the paddle shifters and here has been my observation. I've made 4 in town trips for a total of about 30 miles. I've achieved 17mpg average.
Here is what I did.
Sport Mode then select 2wd.
Manually shift the transmission with either paddles or gear shifter. Target all shifts around 2200 rpm.
Target <2000 (1500 is ideal) rpm for driving constant speeds.
Burning 87 octane.

That's almost identical to how I drive my truck. My driving style is to try to have the transmission up shifting at 2000 to 2200 RPM at every shift point up till 5th gear. After that, it shifts around 1500- 1600 rpm through 6th 7th and 8th

I believe shifting no later than 2,000 RPM the 2,200 RPM is the key to getting better fuel mileage regardless of trim

 

[Upupandaway]

Read that again, I said nothing of mileage. I spoke to the the way tow haul works. That said, I did get 16 17 miles per gallon driving 65 towing that load staying in 7th gear

He said the mileage he got and you said you've observed the same lol, but I get it now that you've reworded/clarified what you were trying to say regardless, you mentioned earlier 21mpg at 70mph in the winter which is 5mpg better than mine at the exact same speed with the exact same trim/specs, so that confirms the issue at hand.

 

[BowDown]

He said the mileage he got and you said you've observed the same lol, but I get it now that you've reworded/clarified what you were trying to say regardless, you mentioned earlier 21mpg at 70mph in the winter which is 5mpg better than mine at the exact same speed with the exact same trim/specs, so that confirms the issue at hand.

I see 21-22 mpg in the winter @ 71-72 mph
In the summer, I see 23-24 mpg at the same mile an hour.
I usually will drive 75mph on trips (to not get run over) and get 21-22 on the highway.

Mixed city summer average over almost 6k miles. I hand calc'd every tank for about the first 3 years and there was never a variance of more than .05


Summer trip @ 75 mph, Dallas to Houston

 

[Idahoktm]

I just pulled a trencher on a trailer around going 65 mph and my instant was 17 to 19. Didn’t use toe haul mode either.

Your truck has Toe/Haul mode?

 

[Trooper4]

These are for the most part robot assembled trucks with little variance in the programming or mechanicals.
The biggest variable is the driver, not the truck; the limited and longhorns are arguably the heaviest of these trucks and I've seen owners repeatedly achieving good numbers and if those 2 can, then all should be capable of the same.

The no 2 vehicle claim, I completely disagree with,; that is the entire point of robotic assembly lines.
Now, could there be some problem with the trucks or not achieving this? Certainly but to say no two trucks can get similar mileage, that's completely false (IMO) or that these trucks regularly don't achieve this mileage also completely false also IMO.

The only definitive way to determine the difference between the trucks is likely going to be to put them on a chassis dynamometer and see if they're making the same power and what the fuel consumption is making those power; ergo measuring parasitic loss or drag in the driveline.
I have no doubt that I could get in another similarly equipped truck and drive my normal style that I could achieve the same mileage that I get in my truck. Too many other people are achieving the advertised mpg.

In my opinion, tires may be the only true variable in this situation specific to the trucks aside from the obvious rear gear ratio.
I know tires can play a large role, my car has a 12 rear wheel horsepower difference using street tires versus drag radials

You believe what you want. Robots aren't perfect. Engine manufacturing doesn't produce IDENTICAL engines, as tooling wears, and bores and other machined surfaces varey. If electric components are identical, then why do some work for the life of the truck, and others fail as soon as one of us drives it off the lot. Read the posts here about all the failures, mechanical and electrical.
This world ain't perfect, and neither are the people making all the thousands of parts that go into thee trucks.. Deal with it, and enjoy your perfect truck. Like I aid before, you're one off the lucky ones.

 

[theblet]

Your truck has Toe/Haul mode?

View attachment 196061

Fixed it

 

[Upupandaway]

Well, fortunately the dealer that I purchased through had a great exchange policy for vehicles with issues, so tomorrow the current truck plagued with issues is being exchanged with a 2022 model that I've had in my possession for a thorough test drive period for the last five days. The one going back will be going straight to auction since they weren't able to figure out the issue, and it's likely more expensive to fix than the loss they'll take on the sale.

The trucks are the same with the following exceptions; the new one has 33x125x22 Rockblade M/T's(coming off as we speak for 305/45/22 Toyo AT3's), no Level 1 Equip Package, is two years newer, and is not an eTorque. I took the new one out and did the exact same route as when I was testing the old white one, and even with larger tires the truck was able to achieve 18.5mpg on the highway and my combined was 15 over the course of the 5 days! So, 2.5mpg better on the highway and 4.2mpg better combined rating. When the old one went in the last combined avg was 10.8mpg

This is what I expected for this truck so I'm happy! I imagine I'll see a slight improvement going from the junk Rockblades to Toyo's as well, and then again in a couple months with summer gas.

Edit: the new truck has 3.92s, the old one 3.21's

 

[law]

Well, fortunately the dealer that I purchased through had a great exchange policy for vehicles with issues, so tomorrow the current truck plagued with issues is being exchanged with a 2022 model that I've had in my possession for a thorough test drive period for the last five days. The one going back will be going straight to auction since they weren't able to figure out the issue, and it's likely more expensive to fix than the loss they'll take on the sale.

The trucks are the same with the following exceptions; the new one has 33x125x22 Rockblade M/T's(coming off as we speak for 305/45/22 Toyo AT3's), no Level 1 Equip Package, is two years newer, and is not an eTorque. I took the new one out and did the exact same route as when I was testing the old white one, and even with larger tires the truck was able to achieve 18.5mpg on the highway and my combined was 15 over the course of the 5 days! So, 2.5mpg better on the highway and 4.2mpg better combined rating. When the old one went in the last combined avg was 10.8mpg

This is what I expected for this truck so I'm happy! I imagine I'll see a slight improvement going from the junk Rockblades to Toyo's as well, and then again in a couple months with summer gas.

Edit: the new truck has 3.92s, the old one 3.21's

out of curiosity since you're canadian and mentioned living in a flat area, are you in alberta or saskatchewan? back when you were posting we were averaging -30 - -40 and only recently it has begun to warm up at around the same time you got this newer truck. i'd suspect that has a fair bit to do with your mpgs especially if you remote start the vehicle to warm it.
i have a 3.92 lim longhorn and i was averaging around 11.8 mpg city driving during those cold weeks, but i'm not light on the gas pedal and go through lots of stop and go traffic.

 

[theblet]

Well, fortunately the dealer that I purchased through had a great exchange policy for vehicles with issues, so tomorrow the current truck plagued with issues is being exchanged with a 2022 model that I've had in my possession for a thorough test drive period for the last five days. The one going back will be going straight to auction since they weren't able to figure out the issue, and it's likely more expensive to fix than the loss they'll take on the sale.

The trucks are the same with the following exceptions; the new one has 33x125x22 Rockblade M/T's(coming off as we speak for 305/45/22 Toyo AT3's), no Level 1 Equip Package, is two years newer, and is not an eTorque. I took the new one out and did the exact same route as when I was testing the old white one, and even with larger tires the truck was able to achieve 18.5mpg on the highway and my combined was 15 over the course of the 5 days! So, 2.5mpg better on the highway and 4.2mpg better combined rating. When the old one went in the last combined avg was 10.8mpg

This is what I expected for this truck so I'm happy! I imagine I'll see a slight improvement going from the junk Rockblades to Toyo's as well, and then again in a couple months with summer gas.

Edit: the new truck has 3.92s, the old one 3.21's

What rims and tires did your old truck have?

 

[Upupandaway]

out of curiosity since you're canadian and mentioned living in a flat area, are you in alberta or saskatchewan? back when you were posting we were averaging -30 - -40 and only recently it has begun to warm up at around the same time you got this newer truck. i'd suspect that has a fair bit to do with your mpgs especially if you remote start the vehicle to warm it.
i have a 3.92 lim longhorn and i was averaging around 11.8 mpg city driving during those cold weeks, but i'm not light on the gas pedal and go through lots of stop and go traffic.

I'm in Eastern Ontario and I can only think of a handful of hills haha! It makes southern ontario look mountainous(and warm) funny enough, my wifes dream is to live in a house on top of a hill so we always talk about moving just for that aspect! Temperatures were pretty close when I was doing my mileage testing as well, although todays its finally above 0 and with the white one that goes back tomorrow, I still only got 16mpg running 70mph/110kmh on this flat 25km highway run. I don't use remote start purely for the hemi tick reasons - I use the block heater overnight and it keeps the block close to 25C when its -25 which is great! much cheaper too haha.

What rims and tires did your old truck have?

The old truck had the stock 20" wheels with 275/60/20 BFG K02's. They're a bit heavier than stock but fortunately just D-loads. The new one had 33x12x5x22 Rockblades (it was my first time hearing that name despite working in a tire shop for years during university), and they are E-rated, so the truck getting the better mileage actually had the heavier tire/wheel set and 3.92's! Fortunately, it's at the dealer now getting the licensing switched over along with 305/45/22 Toyo ATIII's since a plastic junk mud tire is not functional for a Canadian winter!


The old one goes back today/tomorrow, just waiting for the call, and I'll report back with the new one (2022) in a couple weeks again after I've put some miles on it! Pretty pumped and optimistic though!