YJ Gas Mileage? - JeepForum.com

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post #1 of 42 Old 06-01-2012, 09:40 PM Thread Starter
sd92110
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YJ Gas Mileage?

Just calculated my gas mileage at 11-12 miles per gallon, OUCH!
4.2l 6 cylinder 5 speed manual transmission.
Gov. site says it should be 15 city 20 hwy.
I have a rack on it but whoa..
172 miles on a a full 15 gallon tank of fuel...
Anyone wanna buy a Jeep??

Any Ideas??

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post #2 of 42 Old 06-01-2012, 09:53 PM
4x4JB
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Could be worse


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post #3 of 42 Old 06-01-2012, 10:08 PM
pasinbuy
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Quote:
Originally Posted by sd92110 View Post
Just calculated my gas mileage at 11-12 miles per gallon, OUCH!
4.2l 6 cylinder 5 speed manual transmission.
Gov. site says it should be 15 city 20 hwy.
I have a rack on it but whoa..
172 miles on a a full 15 gallon tank of fuel...
Anyone wanna buy a Jeep??

Any Ideas??
If your calculation is that you drove 172 miles on 15 gallons? I have to believe that you did not actually check how much gas that you filled your rig vs the 172 miles. Unless you ran it out of gas? Try starting from a full tank and then figure out your mileage first.

Also you state your wheels are stock, although what size tires are you using?

I have 33 inch tires and I get 15mpg. I have to figure it by adding 10 percent for my odometer being off due to tire size. I would think you should get 14 to 15 if you are not heavy on the skinny pedal.
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post #4 of 42 Old 06-01-2012, 10:16 PM Thread Starter
sd92110
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Full tank.

Yeah I started on a full tank with the trip odometer reset after fueling.

It was 15 gallons and I almost ran out of gas.

Certainly less than a gallon left in the tank.

Thanks!
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post #5 of 42 Old 06-01-2012, 10:19 PM Thread Starter
sd92110
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post #6 of 42 Old 06-02-2012, 06:19 AM
TJEvans
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My '95 2.5L 5 spd YJ gets about 15-16 miles per gallon on average. I use an android app on my tablet to track it. Every time I fill up, I record mileage, gallons added, and price. It calculates everything for me. these are predominantly highway miles.
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post #7 of 42 Old 06-02-2012, 06:29 AM
Louie4
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When I was in college I slapped some stock tires on my jeep and drove it like that for a couple years. I got in the upper teens for gas mileage. I finally wised up and bought a beater Honda for real gas mileage. After school and getting a real job I got a brand new Civic (34 MPG's). The jeep is just for fun now. I don't even know what kind of gas mileage it gets. I may calculate it one day with my GPS just to get an idea of the engine condition.

The best you can do is have the stock tires on, light acceleration, tune-up, and keep your speed around 65 for cruising, and ditch the rack.

Personally I think it's better to get another vehicle for gas mileage purposes but that depends on you.

Lou

I have a jeep...and it is modified...I win.

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post #8 of 42 Old 06-02-2012, 06:32 AM
Old4X
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Could be something mis-adjusted on the engine, or could just be a result of aggressive driving style.

In Kali, you are pretty much stuck with not being able to mod the engine, short of installing a newer motor or installing a state approved fuel injection system.

For ideas, go through a full tune up. Check that all the computer sensors are working properly and you have the correct thermostat in the cooling system. Inflate your tires to 32 PSI.

Drive like a half blind little old lady. About all you can do.

Your mileage is on the low side, but in line with what many here get.

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #9 of 42 Old 06-02-2012, 07:23 AM
crackedcornish
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Jeep ..good gas mileage?

Orange Jeep Club #88

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post #10 of 42 Old 06-02-2012, 07:36 AM
animal0307
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When I bought my jeep first time I checked my mileage I got around 11-12. Through trial and error I have managed to average 14-16. Best way is just keeping it under 55-60.
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post #11 of 42 Old 06-02-2012, 07:45 AM
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in my heep I have to do some extra math to get my real mpg... I have 33" tires and am running 3.55 gears, have learned that the odometer is .2 miles less than it normally would be with stock tires on. SOOO... the math goes like this; I take the number on my trip-o-meter and multiply that by .2 (208 x .2= 41.6) I then add that number back to the milage (208+41.6= 249.6) this number is the real mileage I ran. Then I divide the real number by the gallons put in and wallah my accurate MPG's.


FYI: how I found out that the heep was .2 miles off; simply, I took a car with stock tires on it and drove 1 mile near my home. Took my jeep on the same mile after resetting my trip-o-meter and found the .2 mile discrepancy. Simple. didn't have to do all the crap that has to do with my gear ratio and tire size and planetary rotation while compensating for the gravitation pull of the 14 moon of Jupiter.
KISS keep it simple stupid.

i swear my yj knows when payday is coming...
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post #12 of 42 Old 06-02-2012, 07:55 AM
Anticanman
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Quote:
Originally Posted by sd92110 View Post
Just calculated my gas mileage at 11-12 miles per gallon, OUCH!
4.2l 6 cylinder 5 speed manual transmission.
Gov. site says it should be 15 city 20 hwy.
I have a rack on it but whoa..
172 miles on a a full 15 gallon tank of fuel...
Anyone wanna buy a Jeep??

Any Ideas??

One thing I've learned from living in California: don't trust the government. Concerning Boxer, Feinstein and Pelosi: these shrews are out to get you.

Luck Favours The Prepared
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post #13 of 42 Old 06-02-2012, 08:54 AM
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Quote:
Originally Posted by sd92110 View Post
Just calculated my gas mileage at 11-12 miles per gallon, OUCH!
4.2l 6 cylinder 5 speed manual transmission.
Gov. site says it should be 15 city 20 hwy.
I have a rack on it but whoa..
172 miles on a a full 15 gallon tank of fuel...
Anyone wanna buy a Jeep??

Any Ideas??
Since you're in Cali, that means you have to meet regulations, but Ill say this about the 4.2:

I was averaging 15 with my carter carb. I switched it to the MC2150 and went up to 17. I also did the Nutter Bypass and Team Rush upgrade when I did the carb swap. I was running 31x10.5 tires with 3.07 gears. 3" body lift (don't get me started ).

I did the 8.8 swap. I went to 4.56 gears and a 2" BDS lift. I bumped my mpg to 18. Doesn't sound like a lot, but Ive noticed it in my wallet . Anyway, since you have to stay compliant, I would do the team rush and check my carter carb out.

Keep in mind also that the government site is showing you what the MPG would be in peak shape. Now that you have age on the engine, lifts, winches, racks, larger tires, etc., its going to dramatically impact your mpg. Not to mention what your gear ratio is. If you have larger tires and a lower (numerically) gear ratio, that'll play in to. You want to be in the power band (around 2k RPM) at highway speeds. If you have a higher ratio with smaller tires, thus running your RPMs up at highway speeds, that'll impact the MPG as well.

All in all, jeeps aren't known for their great MPG. 11-13 seems to be the average for an aged YJ.

"A woman's body is a work of art. A man's body is a utilitarian. It's for gettin' around. It's like a Jeep." - Elaine Benes
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post #14 of 42 Old 06-02-2012, 09:01 AM
Sleuthhound
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My dads 89 4.2L with 33s and 410 gears and a lumpy cam gets about 13mpg, my 91 4L with 31s and 307 gears gets about 14-15 in city and 18-20 highway.
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post #15 of 42 Old 06-02-2012, 12:35 PM
Tanrer
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I get that wit my 33s but i have various power/economy upgrades so id say that's about right, hell i get 8mpg offroad/hauling

'89 YJ - AMC 258 -Manual 5 speed -1" body, 2" Shackle, 33" Mudders, Weber Carb, MSD Ignition - Now needs full frame up restore
'99 VW New Beetle - 1.9 TDI - Manual 5 speed - Nothing added yet
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