35" and 37" effect on MPG

alphalife9

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For those running 35s and 37s, have you calculated the MPGs before and after?





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Mattyp1214

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I'm afraid to, its not close to the epa 20mpg...
 
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alphalife9

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I'm afraid to, its not close to the epa 20mpg...
LOL yea. If you ever do though let us know. I'm sure it's better than previous generation Jeeps with the same tires and maybe even better than a stock Hummer H3. I do love how those tires look on the JL and just wonder how severe the MPG tradeoff really is.
 

arcticaaron

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There have been a lot of folks posting photos of their JL on 35s and 37s, can someone supply their actual city and highway mpg they are seeing with the new tires? I'm currently running a land cruiser on 34s getting 11.5 mpg on average.
 

bodam

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I'm at 15.5 since installing 35's
 

Mattyp1214

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14.8 after a couple months with 35s
 

S207307

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15.3 mpg on 35" KO2s (for about 1,000 miles now).
 

TopPinArcher

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All depends on MPH...I’ve done as well as 19.7 between 60-65...over 65 not so good. In town I’m getting 15.8..running 37KO2’s D rated on 17 beadlocks..31psi....100lbs/tire
 

knick33

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What are you getting stock? I'm moving to 35s once mopar fixes the lift, but on stock Rubi I'm getting 18 on the high end for mpg
 

TopPinArcher

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Sorry, I should’ve read the thread title better.. mine was stock for less than 20 miles.... there is another thread where people are reporting in the low 20’s stock..
 

#SquadGoals

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I’m getting 18/19 mostly city on stock, but plan on going to 35s soon. Thanks for sharing.
 

Mattyp1214

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I had my rubicon stock for a week and it was at 17.8
 

Spank

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It's gonna be a little difficult to give accurate fuel economy numbers until programmers are available to recalibrate the speedometer. Even though it's more accurate at lower speeds, the odometer is actually going to increment more slowly than it should. There's one programmer available right now, but it's overpriced and if I understand it correctly, requires the unit to be plugged in at all times. I'm waiting for AEV or Superchips to come out with one that'll work similarly to their JK versions.

Suffice to say, the JL rotates 35s and 37s with relative ease. The power loss is almost negligible thanks to the transmission and while city fuel economy does take a hit, highway isn't actually too bad. I can still get close to 20mpg on the highway up here at 6,000 feet above sea level if I'm not pushing it past 70-75 on my 35" KO2s.
 

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I got 14.3 on a highway trip this week on 35's.

But I also haven't calibrated my speedo
 

W5MQS

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I'm afraid to, its not close to the epa 20mpg...
The EPA estimates that manufacturers do is NOWHERE close to real world driving conditions. They are usually done at 55 mph so I'd be willing to bet that if you drive a tank full of gas on the highway at 55 mph that you'll get what the sticker says.

On a side note, I have a 2013 Ford F-150 4 x 4 with an Ecoboost engine in it...rated at 24 mpg on the highway. The only time I can get that kind of mileage is if I drive religiously between 55 and 60 mph. Otherwise, my mpg is generally between 16 and 18 mpg driving at 70 to 75 mph...with a tailwind...going downhill.
 

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