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Old 09-03-2011, 11:39 PM   #1
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Larger than stock tires and mpg

I plan on putting larger rims and tires on my 2010 jeep. I was wondering if I should expect a huge change in my mpg after the switch. What have your experiences been?

2010 Wrangler Sport

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Old 09-03-2011, 11:47 PM   #2
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Well, I did this on my Z71 Tahoe and there was a change. Went from 17s to 20s for summer and yeah there was a slight difference. The biggest change that I noticed though was in braking and handling---more rotating mass to have to stop and unsprung weight in the corners. The Jeep should be no different. But ading larger wheels is going to be more drag and weight for the the engine to deal with, so there'll be some change for sure. The experienced folks here will have to comment with their real world findings.

My guess might be 2 to 3 MPG...a total guess.

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'12 JKUR

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Old 09-03-2011, 11:51 PM   #3
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Depends on size and tire. In general mud tires are gas guzzlers because of their weight. The wider the tire the more friction/resistance on the road but weight is more of a factor. Case in point the 255/75/17 Goodyear SRA's are a decent size tire but because they are so light they help gas mileage. A mud tire in the same size will reduce mileage by about 2 mpg depending on the tire.

Then there is the larger tire that will lift your Jeep. Any lift cuts the bricks aerodynamics even more then it is now but not much; more like a 1 mpg hit. Again with the Wrangle weight is the most important factor in mileage.

After my small lift and Goodyear MTR's w Kevlar 285/70/17 (very heavy tire), I took a 4 mpg hit and that's a small 33.
2010 Dark Charcoal Pearl Jeep Wrangler Sport S Automatic
4.88 Yukon w/Trac-Lok rear and Eaton ELocker Front - Synergy Gussets - B&M 70264 Trans Cooler
BDS 3" lift - BDS Fox 2.0 Racing Shocks
XHD front Bumper - Trektop NX - Goodyear MT/R w/Kevlar 35X12.5X15 on MB Chaos 5 Wheels - Thrush Turbo Muffler

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Old 09-04-2011, 12:57 PM   #4
Join Date: Aug 2011
Location: Northern Wisconsin (near U.P. border)
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Do what makes you happy and if it means delaying those changes just be patient. It took a couple of years before I made the lift & tire changes but it was soooo worth the wait because I have what I love to see in my garage everyday. Now, after coming from stock tires & suspension to a 4" TrailMaster suspension lift and 33" BFG KM2 mud terrains it seems as though I find myself at the gas pump a bit more often. Whether from the added weight of the lift & tires or the tire type & size alone I cannot say. But can you put a price on pure fabulousness & Jeep love craziness? My credit card says yes but my heart says no. Good Luck!
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