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Old 12-16-2012, 07:50 PM   #1
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Mpg question

I have a 2002 4.0 wrangler with lift kit 33"s and standard. What are y'all getting for mpg? I think I have stock gears. Would that help if I changed my gears out? I get 200 miles Befor the E cones on. Thats about 15 gallons to fill up.

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Old 12-16-2012, 07:58 PM   #2
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That sounds right if you didnt correct for the change in tire size over stock

I usually get 210 before I hit E and fill up with 15 gallons.

210*1.1=231
1.1 cause theres a 10% change in size over stock
231/15=15.4mpg

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Old 12-16-2012, 08:04 PM   #3
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That's what I also get in town and easy on it
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Old 12-16-2012, 08:06 PM   #4
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i get 240 per tank and i corrected for the tire size. but im on 33x10.5
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Old 12-16-2012, 08:13 PM   #5
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Would changing the gears be worth it and how much would it cost approximate
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Old 12-16-2012, 08:14 PM   #6
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Not if your doing if for gas mileage purposes only

1k-1.5k per axle
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Old 12-16-2012, 08:32 PM   #7
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If I had stock tires what would my mpg be? Just curious.
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Old 12-16-2012, 08:35 PM   #8
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I have a stock 4.0 five speed and I got 23 mpg on 9 gallons on Friday downhill across and ben today I drove 237 miles back uphill across va and got 20 mpg. For some reason my 4.0 crushes the normal mileage

John
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Old 12-16-2012, 08:38 PM   #9
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I don't know what my issue is. I have a stock 4.0 automatic with 31x10.50s and can't ever get 200 miles before filling up. 3.07 stock gears.
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Old 12-16-2012, 08:39 PM   #10
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Easy in her too
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Old 12-16-2012, 08:40 PM   #11
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Lol on...
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Old 12-16-2012, 08:43 PM   #12
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Hahahaha very nice. I rolled at about 65 to 70 most of the way up and down hills Stock tires and gears
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Old 12-16-2012, 11:48 PM   #13
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Originally Posted by WVU Mountainman View Post
I don't know what my issue is. I have a stock 4.0 automatic with 31x10.50s and can't ever get 200 miles before filling up. 3.07 stock gears.
X2 well sorta, usually get about 210 out of a tank and put about 16 gal in on a fill up but now I can't get 180 out of a tank and still put about 16 gal in er. Just started happening a couple months ago when weather got cooler out.
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Old 12-17-2012, 12:03 AM   #14
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Originally Posted by fourty4magjr View Post

X2 well sorta, usually get about 210 out of a tank and put about 16 gal in on a fill up but now I can't get 180 out of a tank and still put about 16 gal in er. Just started happening a couple months ago when weather got cooler out.
Winter blend gas
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Old 12-17-2012, 12:13 AM   #15
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Winter blend gas
Yep! I posted something about that about 3 weeks ago and no one knew what winter gas was lol glad you know.
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Old 12-17-2012, 12:23 AM   #16
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it and how much would it cost approximate
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Old 12-17-2012, 06:30 PM   #17
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My '06 4.0L with 6spd is all stock for now, with 3.07 gears and 28" tires. I get around a constant 20mpg, and easily go over 300 miles before my light comes on with my 19gal tank. I calculate my mpg every fillup.

Now my driving is mostly semi-rural on 35-55mph speed limit 2 lane roads, not too much stop and go, but some.

Some time back I had an '85 F150 that got about 17mpg with a 5.0L V8 and 4spd auto. After a 6" lift and 33" tires, I still got about 17mpg, even correcting for the tire size. It would be nice if my Jeep stays at 20mpg after I start modding, but somehow I don't count on it, lol

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Old 12-17-2012, 06:33 PM   #18
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I have 01 5-speed with 31 inch tires no lift and 3.73 gears and do 95% highway and get just a shade under 19mpg
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Old 12-18-2012, 02:15 PM   #19
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I have a 2000 stock TJ, 150K on odometer, rebuilt 2.5 installed about 3.5K ago rolling on 31s.

I see the MPG discussion with MPGs all over the place. Here is what I have to contribute.

According to my GPS my speedometer is slow by about 8% which means I am going about 5 mph faster than the speedometer reads.

According to highway mile markers my odometer is 80% off. I am only going 80% far as the odometer says I am. (If the 31s have been on my TJ from the beginning that means I only have 120K on the Jeep. If the original tires were replaced with these 31s at 40K I would really have only 128K on the Jeep. What effect does 30K miles have on the value of a vehicle)?

In order to get a truer MPG all this has to be taken into account.

I just filled up with 11.3 gallons and 193 miles on the odometer since my last fill up. If I actually went 80% less than 193 miles I only traveled 154.5 miles. Using the actual miles traveled I got 13.7 combined mpg as opposed to the 17.0 mpg I would have if I used the inaccurate odometer reading. I like 17 mpg but that is not what I am getting and I can't fool myself because numbers don't lie.

The number of miles you go between fill-ups alone is not enough to know your MPG. You have to be consistent in where you fill-up (some pumps may have slightly different automatic cut off points) and know the actual miles traveled.

Some of my friends say I have too much time on hand but this stuff is not only fun but beneficial. It is good to know when your MPG begins to fall because it may indicate there is a problem or a problem developing as well as which brands of gas gives the best mileage and other benefits.

Just my 2.1 cents worth.
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Old 12-18-2012, 04:37 PM   #20
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It's about $1200 (parts and labor) for a shop to regear both axles.
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Old 12-18-2012, 04:43 PM   #21
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Anyone try different air pressures to increase or decrease the MPG... anyone find a ideal setting cold ? and hot ?
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Old 12-18-2012, 04:47 PM   #22
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I was getting 11-12 mpg with tire correction (32" mud terrain) and a 2" BB. I swapped out both o2 sensors with 121k on the odometer and saw my first fill up jump to 15-16 mpg. Same exact route to and from work, same driving habits, etc. Is it a fluke? Could be, but I've read an awful lot about old o2 sensors getting lazy and not throwing codes... $80 or so for the pair (NTK from rockauto) and if things continue the way they're going, they could pay for themselves over a period of fill ups.
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Old 12-18-2012, 06:30 PM   #23
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Anyone try different air pressures to increase or decrease the MPG... anyone find a ideal setting cold ? and hot ?
I was thinking of that to. It seems more tire pressure would increase fuel mileage but tread may wear in the center more?
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Old 12-19-2012, 12:01 AM   #24
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Quote:
Originally Posted by herbc View Post
I have a 2000 stock TJ, 150K on odometer, rebuilt 2.5 installed about 3.5K ago rolling on 31s.

I see the MPG discussion with MPGs all over the place. Here is what I have to contribute.

According to my GPS my speedometer is slow by about 8% which means I am going about 5 mph faster than the speedometer reads.
At what speed?

Quote:
Originally Posted by herbc View Post
According to highway mile markers my odometer is 80% off. I am only going 80% far as the odometer says I am. (If the 31s have been on my TJ from the beginning that means I only have 120K on the Jeep. If the original tires were replaced with these 31s at 40K I would really have only 128K on the Jeep. What effect does 30K miles have on the value of a vehicle)?
If your only going 80% as far, your odometer is 20% off not 80% off.

Quote:
Originally Posted by herbc View Post
In order to get a truer MPG all this has to be taken into account.

I just filled up with 11.3 gallons and 193 miles on the odometer since my last fill up. If I actually went 80% less than 193 miles I only traveled 154.5 miles. Using the actual miles traveled I got 13.7 combined mpg as opposed to the 17.0 mpg I would have if I used the inaccurate odometer reading. I like 17 mpg but that is not what I am getting and I can't fool myself because numbers don't lie.

The number of miles you go between fill-ups alone is not enough to know your MPG. You have to be consistent in where you fill-up (some pumps may have slightly different automatic cut off points) and know the actual miles traveled.

Some of my friends say I have too much time on hand but this stuff is not only fun but beneficial. It is good to know when your MPG begins to fall because it may indicate there is a problem or a problem developing as well as which brands of gas gives the best mileage and other benefits.

Just my 2.1 cents worth.
If your Jeep originally had 215 or 225/75/15 tires, and now has 31" tires, the speedometer error should read about 90-92% miles traveled with the 31"s, not 80%. Check your build sheet and actual gear ratio, something is not adding up.

My Jeep is all mechanically stock, and the tires and gearing match my build sheet. I do check my speedometer against mile markers and radar signs, and my speedometer/odometer is fairly accurate. I reset my trip odometer every fillup and my mileage is consistent within about 1 mpg using the same few gas stations. Yeah, I'm as sick as you are when it comes to this stuff, lol

J
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Old 12-19-2012, 12:05 AM   #25
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Winter blend gas
OK.. when it's summer people say Summer blend gas gives you less MPG, when it's winter people say it's the winter blend that causes it. Seriously?? LOL. Which one is it?

You all just need to quit worrying about MPG in a Jeep.. I gave up eventually myself.
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Old 12-20-2012, 12:49 AM   #26
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OK.. when it's summer people say Summer blend gas gives you less MPG, when it's winter people say it's the winter blend that causes it. Seriously?? LOL. Which one is it?

You all just need to quit worrying about MPG in a Jeep.. I gave up eventually myself.
Funny post, but actually up here in New England, I really have not seen much difference in gas mileage between summer or winter, ethanol blend or not?

But I agree with Moabrubi, I don't buy and drive any of my vehicles based on gas mileage...but then again, my motorcycles get 50 to 70 mpg, so that might help,

J
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Old 12-20-2012, 12:53 AM   #27
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OK.. when it's summer people say Summer blend gas gives you less MPG, when it's winter people say it's the winter blend that causes it. Seriously?? LOL. Which one is it?

You all just need to quit worrying about MPG in a Jeep.. I gave up eventually myself.
I have never heard anyone blame anything other than winter gas so what you said is all new to me! LOL
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Old 12-20-2012, 01:20 AM   #28
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I have a stock 4.0 five speed and I got 23 mpg on 9 gallons on Friday downhill across and ben today I drove 237 miles back uphill across va and got 20 mpg. For some reason my 4.0 crushes the normal mileage

John
Is that with 30/9.50 R15 tires? Or are they 215/15s?
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Old 12-20-2012, 01:22 AM   #29
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I think you are referring to the difference in ethanol blended gas, which changes in winter for colder climate locations due to cold start issues with ethanol, or maybe not.

I buy toys as my daily vehicles, which means I can't gripe about MPG. Luckily I also run a motorcycle most of the summer, though I only get 33mpg with the way I ride it. I do however, have fun with my rides! Last vehicle I had that got "great" mileage made me want to brush my teeth with a shotgun it was so boring!
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Old 12-20-2012, 02:43 AM   #30
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Sounds like if you're looking to save gas, you shouldn't be in this forum lol

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