V8 with eTorque

[SacRebel]

Obviously it depends on which truck you purchase and your driving habits. After 8,000 miles my Rebel with 3.92 diff gets 12 mpg city and 15 mpg highway.

 

[Trooper4]

Where is this post of which you speak? I can't find it.

Hey HeliPilot, from what era do you hail? I'm 7/17 air cav 69-70

 

[StuartV]

My mileage sucked until 5700 miles or so. Im at 22,000 miles now, and i just posted a pic on another thread showing Avg Fuel Eco at 20.2 mpg running 78 mph. it does improve.

Found it. Thanks.

How many miles had you gone since you reset that Avg Fuel Economy? That's not over the life of the truck, is it?

 

[HeliPilot]

Found it. Thanks.

How many miles had you gone since you reset that Avg Fuel Economy? That's not over the life of the truck, is it?

I have never reset it since new.

 

[HeliPilot]

Found it. Thanks.

How many miles had you gone since you reset that Avg Fuel Economy? That's not over the life of the truck, is it?

I left San Diego for a trip to Vegas. Fuel Avg was somewhere around 15 mpg the day I left. By the time I got back to San Diego, it had adjusted to the 20.2. So that mileage is purely Hwy. I usually avg 14-15 daily.

 

[Reverse]

Came back to his thread because I think I solved the mystery of the lower mpg on the 2020 Limited compared to our 2014 Big Horn, I stated before that they were identical as far as drivetrain, and this was true. Other than that there was one difference I forgot about and that was the bed cover on the 2014. The Limited didn't have one... until today.

Just got a Retrax One XR installed and then drove my regular commute to work (30 miles one way). Reset the counter and saw an immediate improvement in fuel mileage. It's now much closer to the 2014 (which gets between 19 and 20 on that same commute). Got 19.1 this morning, instead of low 17s, so that bodes well for the future.

 

[StuartV]

Wow. My truck is averaging 14.7 MPG (with 13,000 miles on it now). I don't even want to THINK about how bad it would be if I didn't have my tonneau cover on it... =:-O

 

[Trooper4]

Some of the MPG differences are certainly attributed to the configuration of the individual rig, but of course not all. Individual Rams have variations , no mater what. As dies and different machining wear down, it generates variations from the perfect spec engine. My dad worked in a Studebaker/Packard garage in the early '60's, and drove a '62 Lark with the small block V8. It regularly got 25 MPG. Most all similar engines in like cars got 18 on a good day. Before he sold it he pulled the heads to do a valve job, and it was clean as new. Just happened to be the one in a thousand. But his driving style had a lot to do with it to. He was a conservative driver which makes a difference. So, trying to blame one thing for poor mileage is like blaming a bad cup of coffee for a bad day. It's a combination of many different thing, some of which may be FCA, but certainly not all.

 

[392DCGC]

Came back to his thread because I think I solved the mystery of the lower mpg on the 2020 Limited compared to our 2014 Big Horn, I stated before that they were identical as far as drivetrain, and this was true. Other than that there was one difference I forgot about and that was the bed cover on the 2014. The Limited didn't have one... until today.

Just got a Retrax One XR installed and then drove my regular commute to work (30 miles one way). Reset the counter and saw an immediate improvement in fuel mileage. It's now much closer to the 2014 (which gets between 19 and 20 on that same commute). Got 19.1 this morning, instead of low 17s, so that bodes well for the future.

View attachment 43136

A bed cover should be negligible. If you watch aero tests with the visible smoke stream, air flows freely over the open bed. Opening the windows would likely cause more drag than the open bed would.

 

[Reverse]

A bed cover should be negligible. If you watch aero tests with the visible smoke stream, air flows freely over the open bed. Opening the windows would likely cause more drag than the open bed would.

The tests I have seen actually showed that without a cover there's a lot of turbulence in the bed that largely disappears when a cover is installed. Anyhoo: I'll keep measuring my mpg and see what's what. I'm sure having it in aero mode instead of normal height would help as well.

 

[flyingron]

I'm averaging 18. It goes way up on the highway.

 

[Reverse]

Some of the MPG differences are certainly attributed to the configuration of the individual rig, but of course not all. Individual Rams have variations , no mater what. As dies and different machining wear down, it generates variations from the perfect spec engine. My dad worked in a Studebaker/Packard garage in the early '60's, and drove a '62 Lark with the small block V8. It regularly got 25 MPG. Most all similar engines in like cars got 18 on a good day. Before he sold it he pulled the heads to do a valve job, and it was clean as new. Just happened to be the one in a thousand. But his driving style had a lot to do with it to. He was a conservative driver which makes a difference. So, trying to blame one thing for poor mileage is like blaming a bad cup of coffee for a bad day. It's a combination of many different thing, some of which may be FCA, but certainly not all.

I hear what you're saying, but other than variations due to FCA, there aren't that many variables. I drive both trucks on the same route, with the same fuel, at the same speeds. Ride height in the Limited (due to air suspension) is higher than Big Horn. That and no bedcover were the only variables that I have control over that I can see. So bedcover on, and lowered the truck from 'Normal' to 'Aero' mode.

 

[Bubba33]

A bed cover should be negligible. If you watch aero tests with the visible smoke stream, air flows freely over the open bed. Opening the windows would likely cause more drag than the open bed would.

Yup mythbusters did a test with tailgate up and down. It wasn't better with it down.

 

[Willwork4truck]

Hey HeliPilot, from what era do you hail? I'm 7/17 air cav 69-70

And I thought I was old, enlisted in 73’...

You also need to compare the two truck’s wheel width, tread pattern on the tires for rolling resistance, rear gears, # speeds in tranny and wet weight of the truck itself.

 

[Trooper4]

Read once where it stated that truck designers designed truck aerodynamics to be more effecient with the tailgate up, but I have seen nothing definite in their design info on bed covers.

 

[MannymanX]

I get 18.5MPG when I'm trying... mostly city driving. When I don't look at the gauges and just hit it whenever I like.. I get around 16.5-17

 

[HeliPilot]

Hey HeliPilot, from what era do you hail? I'm 7/17 air cav 69-70

Just saw this...You're before my time. I was born in 72. Air Calvary is SAHWHEET though. I did have 12 years in the Air Force with Air Force Space Command. Learned to fly after I got out. I am in the middle of crossing over to fixed wing as I secured a job with the airlines recently. Thanks for your service!!!

 

[clinecs]

2020 Limited 4WD, tonneau cover, 3.92 rear end and 12 mile commute via expressway to and from work and city driving and its nothing better than 14.9. I am not a heavy foot at all. 1,956 miles as of this post. Came from a Yukon Denali and easily got 17-18 doing same driving. Definitely disappointed.

 

[MannymanX]

2020 Limited 4WD, tonneau cover, 3.92 rear end and 12 mile commute via expressway to and from work and city driving and its nothing better than 14.9. I am not a heavy foot at all. 1,956 miles as of this post. Came from a Yukon Denali and easily got 17-18 doing same driving. Definitely disappointed.

Are you using cruise control?

 

[rotts4u]

It shocking the differences posted. I have a 5.7 E Torque with 3,92. I have no problem getting 19-20 on highway driving at 70 mph