Anyone noted the MPG difference between stock tires/wheels combo and 35" and 37" combo?

[Jeeperjamie]

I'm running 37's with a 3" lift, 3.73 gears and getting almost 19 mpg combined (including hauling a few loads of topsoil). I think it has a lot to do with the weight of the tires/wheels people select.

I've never saw that. If I could get 18 on 37's my decision to go to 37's would be a lot easier

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[Jeeperjamie]

I guess @Jimmy- I need to know what tires you running if you don't mind sharing

 

[Jimmy-]

I guess @Jimmy- I need to know what tires you running if you don't mind sharing

37" Cooper Discoverer AT3 XLT tires with 17x9 Fuel Off-Road Nitro 5 wheels. That combo weighs just about the same as the 285/75's with XD wheels I had prior.

 

[kelkolb]

Border of Foothills and Piedmont area of North Carolina. I'm a Hour and a Half from the Smokey Mountains, so it's rolling hills.

I’m in Greensboro and I get very different mileage. I can get over 18 on a flat highway but any kind of hill it down shifts to 7th and I’m in the 16’s

 

[kelkolb]

I'm running 37's with a 3" lift, 3.73 gears and getting almost 19 mpg combined (including hauling a few loads of topsoil). I think it has a lot to do with the weight of the tires/wheels people select.

Do you normally run around 60mph on the highway?

 

[Jimmy-]

Do you normally run around 60mph on the highway?

No, that would be weird...

I actually have a lake house in the UP of Michigan and a place in New Mexico, so I drive at all different speeds and elevations depending on the state I'm going through. The picture you see here is not a highway, but a back road in the UP of Michigan and the speed limit is 55.

 

[kelkolb]

No, that would be weird...

I actually have a lake house in the UP of Michigan and a place in New Mexico, so I drive at all different speeds and elevations depending on the state I'm going through. The picture you see here is not a highway, but a back road in the UP of Michigan and the speed limit is 55.

Thought I’d ask since that’s a good way to get 18+. Above 65 is when I see a really noticeable drop in mileage

 

[Jimmy-]

Thought I’d ask since that’s a good way to get 18+. Above 65 is when I see a really noticeable drop in mileage

I see the big drops going up hills/mountains or against a strong wind, but it normally evens out when I go back down or going with the wind.

 

[Jeeperjamie]

I’m in Greensboro and I get very different mileage. I can get over 18 on a flat highway but any kind of hill it down shifts to 7th and I’m in the 16’s

You got a Max Tow or another model. I got Max Tow with 4.10 gears and I stay in 8th most of the time unless I hit a nice incline or run over 80 mph on the interstate. I did take up trip up your way to Virgina to pickup my Rubi Rails right after I put the 35's on and I got over 20mpg on that trip. Not sure why it varies so much, could be driving habits.

 

[kelkolb]

You got a Max Tow or another model. I got Max Tow with 4.10 gears and I stay in 8th most of the time unless I hit a nice incline or run over 80 mph on the interstate. I did take up trip up your way to Virgina to pickup my Rubi Rails right after I put the 35's on and I got over 20mpg on that trip. Not sure why it varies so much, could be driving habits.

Max tow as well. Even at 70 it’ll downshift with a very small hill. What tire pressure do you run?

 

[Jeeperjamie]

Max tow as well. Even at 70 it’ll downshift with a very small hill. What tire pressure do you run?

34-36 psi on 315 70 17 BFG KO2S, they weight about 62.4lbs a piece. Mine are the E rated, they make a C Rated as well, it's a little heavier at 63lbs. I've always ran E rated on my rigs though.

 

[kelkolb]

34-36 psi on 315 70 17 BFG KO2S, they weight about 62.4lbs a piece. Mine are the E rated, they make a C Rated as well, it's a little heavier at 63lbs. I've always ran E rated on my rigs though.

Mine are E and 63 lbs. Almost the same setup.

 

[Gordon M.]

You are getting 17 mpg on 37" tires? If that is correct then its great. I wonder if anyone has a similar experience.

I actually just switched to 37's from 35's and found I went up to 17 from 16, you lose 8th gear on country and back roads so your Rpm's are more in the power band.

 

[LiftedrubiconJT]

For everyone who’s getting the good mileage how much psi are you running in your tires? I have 20 inch wheels with 35s I can’t get over 14 mpg and I’m running 32 psi

 

[Jeeperjamie]

For everyone who’s getting the good mileage how much psi are you running in your tires? I have 20 inch wheels with 35s I can’t get over 14 mpg and I’m running 32 psi

315 70 17 and run between 34-36 psi

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