Gas Mileage w/lift & 35's - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 48 Old 07-14-2010, 07:24 AM Thread Starter
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Gas Mileage w/lift & 35's

I'm not normally one who cares about gas mileage but in the 25 miles I've put on the Jeep since doing a 4" lift and 35's (Baja MTZ's) I've already used nearly a quarter tank of gas. The thing is, I know that "25 miles" isn't exactly accurate since I haven't adjusted the computer for the new tires, but still, it just seems to be burning fuel a LOT more than I expected it to.

I'm ordering the AEV tuner today so I can adjust for tire size and turn off the pesky tire pressure indicator so I'll have an accurate mileage reading. My question is, what can I do next to get back some of those lost MPG's? Just gears? Everyone has suggested I go to 5.13's, will that actually improve mileage over the 3.whatever's that are in there now?
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post #2 of 48 Old 07-14-2010, 07:44 AM
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5.13 will give you more power not more MPG. If anything you might see less MPG.

What is your current MPG?
Stick or auto?

I driver around 44miles each day to and from work. I average 17 MPG.

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post #3 of 48 Old 07-14-2010, 08:01 AM
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I drive about 45 miles per day to and from work and I get 11.5-12.5 mpg. Thats with 37's and 5.13 gears. I am a bit heavy on the gas I guess. F it
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post #4 of 48 Old 07-14-2010, 08:29 AM
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I average 16-18mpg on 35s, you need to figure out what gear ratio you have in yours. And please do an accurate mpg test...

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post #5 of 48 Old 07-14-2010, 10:04 AM
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I too average 16-18 mpg with 35's and the stock 4.10's. I did reprogram with SuperChips and run Performance 91 with High Octane gas. My ride is a DD with about 120 miles a day commute. Once you adjust your speedo and run a few tanks through it you should get a better feeling of the gas mileage. You still need to find out what ratio you have.

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post #6 of 48 Old 07-14-2010, 10:37 AM
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post #7 of 48 Old 07-14-2010, 11:19 AM Thread Starter
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3.73 gears, I just ordered the AEV ProCal will recalibrate speedo & see how we're doing from there.
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post #8 of 48 Old 07-14-2010, 11:23 AM
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I've got 4.10's, auto, 4dr, and 32.5" (actual measured height) tires. I get 15 to 16 highway and 10 to 12 city. I'm also super heavy on the skinny pedal.
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post #9 of 48 Old 07-14-2010, 11:24 AM
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3.5" lift and 35" MT Bajas with 5.13 gears = 16.5 mpg

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post #10 of 48 Old 07-14-2010, 11:47 AM
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Got an 07 Rubi 37 in tires 410 gears Super Chip milage program reset dash and run to the shore F around all day and head home and end up around 18mpg have to do the math and see whats up.
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post #11 of 48 Old 07-14-2010, 12:03 PM
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35's and 5.13's. I'm in the 16 range on a cool day. AC on around 12 if I'm lucky. Doors off AC off 19 mpg. Seems like every time I add something to the jeep mpg gets lower and lower. I did own a H2 before the jk and only got 9 to 11 mpg so I'm kinda use to bad mpg.
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post #12 of 48 Old 07-14-2010, 01:19 PM
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I get 14-16 on 35's but I have 4.10's and a 6-Speed...

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post #13 of 48 Old 07-14-2010, 09:05 PM
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Everything you do will reduce the economy. The lift produces more dirty air under the Jeep. 35" tires are heavier and the rolling resistance is higher and 513 gears will take another 10% off your mpgs. If you started near 19 mpg when stock, you will lose 3-4 mpg and with a heavy foot 5-6. figure a 20-25% drop and you'll be close. But, Hey, it's a Jeep.
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post #14 of 48 Old 07-24-2010, 03:52 PM
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14 mpg with 5.13 ans 35's. Same with the 3.73.
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post #15 of 48 Old 07-24-2010, 04:03 PM
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I'm seeing about 12-12.5mpg right now with the A/C on. That's with 35s, stock 4.10s, auto trans, and a good amount of aftermarket steel tacked on. I've got the Superchips Flashpaq but haven't tried any of the tunes yet - only corrected my speedo/odo. My commute is a whole whopping 14 miles round trip though, through residential areas (speed limit never gets above 40mph) with one school zone and 8 stop lights. And I'm easy on the gas too.

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post #16 of 48 Old 07-26-2010, 11:33 AM
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about 16.5-17 with 1 inch lift and 35's (unlimited hardtop). 4.10 auto, aftermarket front bumper, fullsize spare
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post #17 of 48 Old 04-04-2011, 06:13 PM
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I get 13l/100km. canadian gallon is 4.5l, 100km is 62miles, equates to approx. 20.66m/gal.

35" baja claws and 4:10's in an unlimited ruby on the hiway at around 65MPH in 6th, In town I get a bit better around 12.3l/100km if I go easy and use 5th alot. Had 600lbs of thinset cement riding on board for the week and milegae didn't get any worse.
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post #18 of 48 Old 04-04-2011, 06:16 PM
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I get 13l/100km. canadian gallon is 4.5l, 100km is 62miles, equates to approx. 20.66m/gal. on my side of the river. 18.12mpg on U.S. side.

35" baja claws and 4:10's in an unlimited ruby on the hiway at around 65MPH in 6th, In town I get a bit better around 12.3l/100km if I go easy and use 5th alot. Had 600lbs of thinset cement riding on board for the week and milegae didn't get any worse.
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post #19 of 48 Old 04-04-2011, 07:58 PM
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35's with 5:13 auto average 13 - 14 mpg. I like the feel of the 5:13 but im pretty sure 4:88's would have netted better economy, just not sure how much better


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post #20 of 48 Old 04-04-2011, 08:21 PM
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its a jeep, its shaped like a brick, want good gas milage buy a honda

im sitting at around 12-14 with 35 and 4:10 but with the wind and the hills around here 6th gear is about useless especially topless.

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post #21 of 48 Old 04-04-2011, 09:35 PM
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I'm getting about 15 with 35s and 5.13 gears in a stick right now. I also have a heavy foot.
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post #22 of 48 Old 04-05-2011, 09:47 AM
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16.8 w/ 35s and 4.88
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post #23 of 48 Old 04-05-2011, 06:28 PM
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I get 16-17 on the freeway with the 33's and 3.73 gears in auto.

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post #24 of 48 Old 04-05-2011, 08:39 PM
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approximately 15.5 to 16 with auto 3.5 lift 4.10 gears and 35 in tires(they measure about 34 or a little under) and have used the AEV ProCal to adjust for tire size and all that. Now if I drive harder or heavier footed then I'm down aroun 12 to 13 range but if I keep in mind how I accelerate and what not then I'm getting the higher 15 to 16 range. That's using 89 octane and for the most part level ground(bout all we have in North Dakota). When I used 90 octane or above I felt I gained a little mpg's but nothing that would make up for the price difference.

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post #25 of 48 Old 04-06-2011, 12:39 AM
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i get anywhere from 14-16 mpg average depending on how much city driving i do. also, with the superchip recalibration the mpg reading from the dash is within .2 mpg's of accuracy in my experience.

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