Lift - Bigger tires questions!

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skizmz123

New member
I have heard from a lot of people that bigger tires and/or lift will decrease MPG. Ive also read that bigger tires can increase fuel economy on highway. I understand heavier tires create the need for more fuel consumption so no doubt in my mind that heavier tires (bigger-more rolling resistance) will decrease mpgs.
I want to do 3"front 2"Rear Cornfed. Does anyone have personal experience with spacer lifts decreasing MPG?? I also eventually want to put 33's on the runner, does anyone have 3" spacer lift with 33's that can tell me the decrease in their mpg??? Thanks!
 
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Do a search. This is discussed 5 times a week. You will loose mileage. Also check the Performance zone, tire section of the forum.
 
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I know its discussed.... Im asking a specific question about 3" cornfed lift and 33" tires on 17" wheels. Im not on fast internet atm so I dont want to search through for hours seeing if i can find someone talking about my specific question. I know I will loose MPGS....... I made that very obvious im wondering if someone has personal experience with that set up, and an accurate calculation (not computer because obvously they are off, and will be greatly off after speedo is not reading correctly). Im not trying to be rude, thanks for a quick responce
 
When you change the tire size you effectively change the gearing. With different size tire your RPMS will change at different speeds. If you RPMS are where the engine runs easier you mileage will increase, if not it will decrease. And like you said the extra rolling resistance will decrease mileage. I suppose that even lifting the vehicle could possibly, maybe, not likely but could happen in a parallel universe change the aerodynamics’ of the vehicle enough to increase fuel usage.

On my Jeep I have re-geared the axles. On the Freeway I get better mileage with 35” tires than I do with 33” tires. It changes from about 13-15mpg.
 
Ross said:
When you change the tire size you effectively change the gearing. With different size tire your RPMS will change at different speeds. If you RPMS are where the engine runs easier you mileage will increase, if not it will decrease. And like you said the extra rolling resistance will decrease mileage. I suppose that even lifting the vehicle could possibly, maybe, not likely but could happen in a parallel universe change the aerodynamics’ of the vehicle enough to increase fuel usage.

On my Jeep I have re-geared the axles. On the Freeway I get better mileage with 35” tires than I do with 33” tires. It changes from about 13-15mpg.
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Thanks- understanding it more now
 
skizmz123 said:
I know its discussed.... Im asking a specific question about 3" cornfed lift and 33" tires on 17" wheels. Im not on fast internet atm so I dont want to search through for hours seeing if i can find someone talking about my specific question. I know I will loose MPGS....... I made that very obvious im wondering if someone has personal experience with that set up, and an accurate calculation (not computer because obvously they are off, and will be greatly off after speedo is not reading correctly). Im not trying to be rude, thanks for a quick responce
Click to expand...

Ayyy I know you asked this along time ago but what size tires are you running with this lift?
 
I installed a 3/2 lift on my 07. It wasn’t a spacer lift. 5100’s, 884’s up front and super flex tears along with 275/70r17 e rated ko2’s. I lost 1.5 after installing all that. The E rated tires kill the mgp.
 
If you remove factory rake, it will effect MPG as well from an aero perspective… Unloaded I always keep my front lower than the rear. Loaded up I sit pretty level, which is what you want.
 
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