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Old 03-07-2013, 08:48 AM   #1
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Larger tires MPG

So I've been asking around the forum and everyone seems to point me to a 2.5" suspension lift and some 35" wheels but how bad would they compromise my MPG I'm getting on average around 15 mpg on my stock black ops JKU according to my dash. It's not to bad because I just cruise with that Eco feature on. Can someone tell me how bad it goes down or better yet how it's not bad at all. Is it possible I could find mods to increase my fuel economy? (I.e. cold air intake, engine mod, ect.) I don't want to make it a hybrid I would just like to recover what I would lose with the lift and tires.

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Old 03-07-2013, 07:29 PM   #2
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Originally Posted by Shute47 View Post
So I've been asking around the forum and everyone seems to point me to a 2.5" suspension lift and some 35" wheels but how bad would they compromise my MPG I'm getting on average around 15 mpg on my stock black ops JKU according to my dash. It's not to bad because I just cruise with that Eco feature on. Can someone tell me how bad it goes down or better yet how it's not bad at all. Is it possible I could find mods to increase my fuel economy? (I.e. cold air intake, engine mod, ect.) I don't want to make it a hybrid I would just like to recover what I would lose with the lift and tires.
Igot an aem dry flow cai and a banks monster cat back gave me 2 to 3 mpg more and noticeable power increase. Some people dont like the increased noise but it dont bother me none its not that bad i like to hear my engine!

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Old 03-09-2013, 10:10 AM   #3
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Are you running stock gears?

I regeared to a 4.10. I was getting about 16 mpg on a 2.5" on 33's. Now I get about 18 mpg on 35's. (2012 JK). It seems that the 35's brought my RPMs back down a little bit and improved mileage. Now I just started installing a 4" lift today so we will see if it changes again!
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Old 03-09-2013, 01:56 PM   #4
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Going by your profile you have a 2011 Rubi. Mine is also a 2011 Rubi but just not the Black Ops and I'm running 35's. Any ways you need to get the pro cal and reset your tire size ( set it with the od of the tire not the tire size)
Without the Pro Cal your speed & gas mileage will be off.
I will say that I don't have the Pro Cal yet but if I drive under 70 on the hwy. and keep my speed within reason around town I get 14.5 around town and 18 on road trips.
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Old 03-11-2013, 11:01 AM   #5
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Are you running stock gears?

I regeared to a 4.10. I was getting about 16 mpg on a 2.5" on 33's. Now I get about 18 mpg on 35's. (2012 JK). It seems that the 35's brought my RPMs back down a little bit and improved mileage. Now I just started installing a 4" lift today so we will see if it changes again!
I plan on doing the same 2.5" lift and 35 tires thanks for the advice. Enjoy the new lift!
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Old 03-11-2013, 11:04 AM   #6
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And yes I am running stock gears. I haven't changed anything so far
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Old 03-11-2013, 11:31 AM   #7
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If you run 35's I highly suggest a regear. If you are 2012 or newer, 4.10 seems to be just fine to run 35's. Older Jeeps seem to prefer 4.88 to be comfortable and less "dogged."
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Old 03-11-2013, 11:37 AM   #8
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If you run 35's I highly suggest a regear. If you are 2012 or newer, 4.10 seems to be just fine to run 35's. Older Jeeps seem to prefer 4.88 to be comfortable and less "dogged."
I have a 2011 rubi
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Old 04-11-2013, 10:39 AM   #9
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Ok, I have a Maual 2012 Rubicon. Just installed a 4 Mopar lift and 35's Baja Claw Mickey Thompsons.
I had the dealership reprogram the computer for the changes but My ECO isn't really working anymore besides when I shift into nuetral and going down hill. My MPG is APX14.4 at the moment. I stay well within the green RPM sector so as to get best gas milage but as I said, the ECO will not stay on even when I'm light and consistant on the gas. Any thoughts??

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