Tire Help
Thread Starter
JK Newbie
Joined: Jun 2014
Posts: 3
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Tire Help
I have a 2010 4 door JK and i plan on putting 35 inch tires on. i was going to go with 33's but i know I'm going to want bigger but i've been looking around a lot to figure out what changes i would need to make (besides a lift) to get it done. I've also read a lot about gas MPG change. some say its not a big change, others I've read its a huge change. So, my question for that is how much of a change is it? thanks.
JK Freak
Joined: Aug 2011
Posts: 681
Likes: 0
From: Springfield, MO
It all varies... Your driving habits, your gearing, what tires you choose, performance upgrades, and your area (Hilly or flatlands)...I didn't notice much of difference when I had my 35's. A little slower off the line and passing people on the highway became strategic, but fuel mileage wasn't but a few MPG's off. It's well worth it in my eyes.
JK Freak
Joined: Dec 2009
Posts: 607
Likes: 0
From: West Tennessee
Went from stock tires to 35s. From 21MPG to about 17MPG, if my math is right. I didn't buy my Jeep for mileage though. I have 3.73 gears and as long as the roads are somewhat flat it stays in overdrive, but running up and down hills it is always changing gears. If you think you want 35s, get them. Or every time you see a set of them you'll be sick haha
JK Enthusiast
Joined: Feb 2013
Posts: 111
Likes: 0
From: NJ, USA
This is how my mpg changed with each modification. Please note I have 33" tires, not 35"s.
In case the pic is not large enough to see clearly, adding 1.5" lift took away 1.5mpg. Then adding 33"s took away additional 2mpg.
Notice, however, that because circumference of the tire is larger in 32->33 transition 0.5mpg will be "lost" due to that factor. 32->35 is a 9.1% difference, so figure 1.5mpg less only because you travel more per same number of shaft revolutions. So, your ODO shows you traveled less than you actually did. So, whatever mpg you get with 35", add about 1.5mpg to get the actual mpg, unless you changed computer settings to reflect larger tire diameter.
In case the pic is not large enough to see clearly, adding 1.5" lift took away 1.5mpg. Then adding 33"s took away additional 2mpg.
Notice, however, that because circumference of the tire is larger in 32->33 transition 0.5mpg will be "lost" due to that factor. 32->35 is a 9.1% difference, so figure 1.5mpg less only because you travel more per same number of shaft revolutions. So, your ODO shows you traveled less than you actually did. So, whatever mpg you get with 35", add about 1.5mpg to get the actual mpg, unless you changed computer settings to reflect larger tire diameter.
Last edited by davison0976; Aug 5, 2014 at 08:11 PM.
