Terrible MPG - 2022 RAM 1500 4WD Crew Cab Short Box 5.7

[Lpsouth1978]

I think once you adjust for the bigger tires you will see that you can get closer to 14+ (once the truck is broken in). I have a very similar setup and get about 14.5 in town. Get AlfaOBD or Tazer (or find someone near you that has one) and correct for the tire size.

I also installed a PedalMax to have better throttle response and control. Can't say how much this helps (since I installed same time as tires), but there have been a number of reports of small gains in fuel efficiency.

 

[jkm312]

You still have a new engine with not that many miles on it. My new gas mileage wasn't as severe as you are describing, but I'm set up differently. Mine finally got better after 7 or 8 thousand miles on the clock. I stayed with stock tire size when I changed last fall to Cooper's AT34S. The Cooper's are heavier than the Dueler's. I lost 1/2 mile per gallon and then another mile with winter fuel, winter cold, more rolling restistance you get with cold tires. As already stated once you break 70 mph+ your gas gauge needle races your speedometer needle across the dash. How long do you warm the truck up? That can bite hard if it's frequent. A couple of under inflated tires, even a little adds up. How much stop and go driving? How heavy of a foot do you have? All questions for you to consider.

 

[Mountain Whiskey]

Stock were dueler hl alenza, 275/55/20 31.9 in diameter: 38 lbs
New tire: Wildpeak AT3 275/65/20 35 in diameter: 66.1

Gears: 3.21

I had a similar 2014 Chevy Silverado, same config, that got closer to 17-19 MPG, which is more so why this is alarming. I find it hard to believe an extra 130LBs from tires is going to knock my MPG down to nearly half of what the vehicle is rated for. Does this sound odd?

Also, are there config adjustments I need to make due to the bigger tires, added 3 in diameter? The dealer said they have nothing to make this change.

The anemic 3:21 gears sputtering and coughing to try and turn those 35s over is half the battle.

 

[bigdodge]

Stock were dueler hl alenza, 275/55/20 31.9 in diameter: 38 lbs
New tire: Wildpeak AT3 275/65/20 35 in diameter: 66.1

Gears: 3.21

I had a similar 2014 Chevy Silverado, same config, that got closer to 17-19 MPG, which is more so why this is alarming. I find it hard to believe an extra 130LBs from tires is going to knock my MPG down to nearly half of what the vehicle is rated for. Does this sound odd?

Also, are there config adjustments I need to make due to the bigger tires, added 3 in diameter? The dealer said they have nothing to make this change.

what engine do you have?

 

[Mountain Whiskey]

Doesn't look like anyone said it yet but this is huge.

Soon as you get up to and over 70 your MPG's drop harder than Biden's approval ratings (sorry, I couldn't help myself!!)

If you stay between 62 and 68 you'll do much better. That's just how it is for these trucks.

@AngelPhoenix is right about speed. I have a lift, 3:92s, 35 tires and typically drive 50 miles of highway to work. Keeping between 70 and 85 just kills it. Driving on the weekend away from the city on normal roads between 40 and 50 I bumped up like 4 mpg for the day.

I quickly reversed that on Monday so the electric guys could have more carbon footprint to make up for.

Angel, great analogy with the Brandon approval reference!

 

[Mirowpl]

The anemic 3:21 gears sputtering and coughing to try and turn those 35s over is half the battle.

here we go again…..

 

[ferraiolo1]

Stock were dueler hl alenza, 275/55/20 31.9 in diameter: 38 lbs
New tire: Wildpeak AT3 275/65/20 35 in diameter: 66.1

Gears: 3.21

I had a similar 2014 Chevy Silverado, same config, that got closer to 17-19 MPG, which is more so why this is alarming. I find it hard to believe an extra 130LBs from tires is going to knock my MPG down to nearly half of what the vehicle is rated for. Does this sound odd?

Also, are there config adjustments I need to make due to the bigger tires, added 3 in diameter? The dealer said they have nothing to make this change.

It’s the high gears and large tires.

Also did you have your Speedo re calibrated for the large tires?


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[Rebel2022]

The #1 city mpg killer is short trips and cold weather. If you live in an area that gets below freezing and make frequent short city trips 8-10miles this kills your mpg. Add in a few minutes of warming up time = easy sub 10mpg.

 

[Redfour5]

where do you live? winter gas mix sucksssss here in the midwest.

It sucks everywhere... I distinctly have noted the change and not a good one here in MT when they change over in winter and the opposite in summer.

 

[SD Rebel]

As already mentioned, you have the perfect storm of variables to give you the lowest possible mpg for your vehicle. Bigger tires, level, city driving, BOOM!!!

I've documented in the past, with just a 1/2" difference in tire height (same exact tire except slightly taller), that I lost over 1 mpg!

 

[Idahoktm]

As already mentioned, you have the perfect storm of variables to give you the lowest possible mpg for your vehicle. Bigger tires, level, 3.92, city driving, BOOM!!!

I've documented in the past, with just a 1/2" difference in tire height (same exact tire except slightly taller), that I lost over 1 mpg!

The OP has 3.21 gears, but gearing isn't a player driving around town anyway. The lift isn't hurting his city driving mpg's either. Those heavy 35's and winter gas are the culprits.

 

[SD Rebel]

The OP has 3.21 gears, but gearing isn't a player driving around town anyway. The lift isn't hurting his city driving mpg's either. Those heavy 35's and winter gas are the culprits.

Oh gotcha on the 3.21, but I was thinking combined driving overall, though of course his worse will be city. But his highway isn't great either.

 

[Idahoktm]

Oh gotcha on the 3.21, but I was thinking combined driving overall, though of course his worse will be city. But his highway isn't great either.

I figure his highway numbers will increase to about 17-18 mpg once he gets his speedometer recalibrated and summer blend fuels come back. He will probably gain another 1 mpg once his motor breaks in.

I never paid attention to the difference between winter and summer blends in the past. It's probably due to the fact that I'm in 4WD most of the time on snowy roads. The last couple of weeks it's been cold, but with dry roads, and I was shocked that I lost over 2 mpg compared to summer driving. I realize the cold air plays a part, but I didn't know winter gas was that bad.

 

[AngelPhoenix]

@AngelPhoenix is right about speed. I have a lift, 3:92s, 35 tires and typically drive 50 miles of highway to work. Keeping between 70 and 85 just kills it. Driving on the weekend away from the city on normal roads between 40 and 50 I bumped up like 4 mpg for the day.

I quickly reversed that on Monday so the electric guys could have more carbon footprint to make up for.

Angel, great analogy with the Brandon approval reference!

My comment got deleted lol must have struck a nerve

edit: you had the right idea, should have said "Brandon"

 

[MontFla]

I have 3:92 stock 275/55/20 and get 17 to 18 semi city.. ie… us1 Florida on I95 at 75 I get 21 to 23. First oil change was at 1600 ish miles second one was at 6000. And I did an old school break in.

 

[Mountain Whiskey]

My comment got deleted lol must have struck a nerve

edit: you had the right idea, should have said "Brandon"

Plenty of snowflakes. The plow truck hits me pretty regularly! Not to worry, Summer is coming........

 

[Cleatus]

i am switching from gladiator to RAM-- so a different vehicle but here is what i saw:
1. putting the bigger tires on lowerd my mpg
2. added a lift. lowered my mpg
3. my "city" driving KILLED mpg
4. if i run over 60-65, the mileage drops uuugley (on the jeep it would shift to 7th and stay there--killing mpg

 

[ferraiolo1]

Who knew physics class would have paid off in the real world!

More rotating mass = less mpg
lLifted with more drag coefficient = less mpg
Higher speed increasing drag = less mpg


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[90goldtsiawd]

I'm at the same 9.9mpg with only city driving currently after adding 34s to my truck(CC/short bed/3.92s). Sounds about right.

 

[ekaz]

I moved to 305/45/22's and I am around 10 in city driving. I haven't adjusted anything for tire size yet. Debating if I am going to since it isn't a huge difference anyway