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Unread 08-04-2010, 05:28 PM   #1
drowe303
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Is my gas mileage normal?

I keep reading that people are saying their stock wrangler is getting like 18-22mpg. When mine was stock, I only got 16..

Now that I have 35s and a 2.5" lift, I get about 13mpg.
I have also read that people with 35's are getting as high as 18mpg. How is this possible.

I have an unlimited, Manual with 4:10 gears. Would 4.88 gears take my mpg up to around 18mpg?

I still have the air filter. If I replaced it with a K&N drop in, would it help some?

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Unread 08-04-2010, 05:37 PM   #2
mjelder
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Sound sabout right to me. I've heard all that too, but i've had 4 different wranglers, 2.5's 4.0's 5 spds and automatics and i've had mileage all around those numbers. manuals get better mileage from what i've seen and the 4 cylinders do as well. throw on larger tires and you have a noticeable difference in mileage. I've gotten as low as 12mpg with 33's on a straight 6 5 spd and as high as 22 with stock wheels and a 4cylinder 5 spd. gotta remember, every jeep and engine is just a little different. so we all vary some. might change out a dirty air or fuel filter or perhaps run some carb or tank cleaner through your system. always seemed to help a little bit, even if it was just making me think it ran more efficiently haha.
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Unread 08-04-2010, 05:43 PM   #3
owenswj
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Yeh man, I get about 13.5 to 14 in the city. Mines stock too. The problem with mine is short stop and go trips everyday. The best I ever got was around 24 mpg's on a roadtrip from vegas to mississippi. That was the leg between flagstaff and albequerque with a tailwind. Most of the time highway sits around 17.5 to 19 if I'm lucky and thats not computer calculated. I do it the old fashioned way. Computer seems to be off sometimes.
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Unread 08-04-2010, 05:57 PM   #4
Farmdiesel
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Well it all depends on driving style. I think to get the 18-20 range, you have to drive with an easy foot and shift around 2500K or earlier. Of course terrain, stop and go, temps, etc all factor in. That being said I have a 6sp with 4.10s and have avg. around 19-20 stock and similar since a 2in coil lift. That's mostly hwy driving with 20-30 mile trips. Waiting to see how 33s will affect the mpg once they're added. I know people say don't drive a jeep for the miles per gallon (more like smile per gallon) , but I like to check my MPGs frequently to rule out any mechanical issues or changes in enginer performance. -YMMV
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Unread 08-04-2010, 06:00 PM   #5
ronjenx
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Quote:
Originally Posted by owenswj View Post
Yeh man, I get about 13.5 to 14 in the city. Mines stock too. The problem with mine is short stop and go trips everyday. The best I ever got was around 24 mpg's on a roadtrip from vegas to mississippi. That was the leg between flagstaff and albequerque with a tailwind. Most of the time highway sits around 17.5 to 19 if I'm lucky and thats not computer calculated. I do it the old fashioned way. Computer seems to be off sometimes.
The highs and lows quoted above are what I see with mine.
My lifetime average for my JK is around 18.5 mpg because "city" for the Bangor area does not include the kind of traffic jams people see in large cities.

The one time it went down to around 13 mpg, there was a lot of construction in town, requiring lots of stop and go.

I don't keep track when the fuel is burned off road. It might take the shine off the trip.
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Unread 08-04-2010, 06:06 PM   #6
DeepSky
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FWIW I get about 13MPG mixed with 35s, 4.10s, 4" lift, and its a 4 door w/ the auto. I recently spoke with another JK owner in person with about the same setup and he reported 13MPG too so you seem to be in about the right spot.
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Unread 08-04-2010, 06:17 PM   #7
RickyRedJK
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2010 Unlimited Sport all stock (I know, shut up), 6spd, 3.73 rear end, P255/75R17, I have just over 5000 miles on it and have a running MPG average of 18.62 (calculated, not computer). My best mileage on a tank was just a bit over 20 MPG, and my worst tankful(s) was on vacation doing 70-75 on the interstate for hours at a time, and then it avg'd 16.8 MPG.

Given that I'm all stock, I would think, compared to some of the comments I've read here, i'd be a bit higher than 20ish on the highway without a lead foot...but, on the other hand I'm glad it still holds almost 17MPG at interstate speeds fully loaded w/passangers and wife's unholy amount of luggage.

YMMV.
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Unread 08-04-2010, 06:21 PM   #8
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Unread 08-04-2010, 06:23 PM   #9
troy32323
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2010 auto with 3.73 and stock tires. I am getting 20mph calculated including rush hour traffic every morning. I drive real easy and always cruise at 65.

My 05 TJ got about 17 until I put on Thornbirds that were almost the same size as stock and just the weight of the tires brought my mileage down to 12mpg. That is why my JK is still stock. I commute 60 miles a day and do not want to sacrafice mileage until it is no longer my daily driver.
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Unread 08-04-2010, 06:33 PM   #10
1222
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Donít forget about the gas. Gas with ethanol (E10) burns up way faster than gas without.
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Unread 08-04-2010, 07:40 PM   #11
jstrubberg
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2009 2 door, 35" tires and a 3" lift and I average 14.5 MPG. I plan to add a Superchips tuner and expect around a 1 MPG improvement.

Going to a higher gear ratio will likely give you worse mileage, not better.
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Unread 08-04-2010, 07:43 PM   #12
JeffinWesternWA
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Try to shift at about 2K~ rpm's, coast more into stops and smooth slow starts will add 1-2MPG to your number. Keep tires 2-3 lb over rec pressure. I've averaged OVER 20 MPG on first 3K miles of my JK w/ 6 sp/3.73's. Even got 23 mpg on highway on nice cool day at 65 mph level interstate. Keep the tires well inflated, the "junk" ota the Jeep and the idling to a minimum all will help...
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Unread 08-04-2010, 07:44 PM   #13
TxJeepGuy2
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Quote:
Originally Posted by DeepSky View Post
FWIW I get about 13MPG mixed with 35s, 4.10s, 4" lift, and its a 4 door w/ the auto. I recently spoke with another JK owner in person with about the same setup and he reported 13MPG too so you seem to be in about the right spot.
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Unread 08-04-2010, 07:48 PM   #14
Shad
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My four door Sahara automatic averages around 17-18 mph.
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Unread 08-04-2010, 08:03 PM   #15
drowe303
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It seems as my mileage is normal then. Just to mention, I live in the city and drive in a lot of stop and go traffic. I do shift under 3k rpms and start off at lights fairly slow.
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3.8L V6 , 35" tires , JK Wrangler , mileage , miles per gallon , mpg , wrangler

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