Mpg
11-25-2012, 05:02 PM
#5
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you have an auto or stick?If stick with 3.73 or 4.10 are ok,but an auto with the same you need to re-gear to bring your rpm's back to stock.After that use a programmer for fine tuning
11-25-2012, 07:01 PM
#6
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Originally Posted by familytime
you have an auto or stick?If stick with 3.73 or 4.10 are ok,but an auto with the same you need to re-gear to bring your rpm's back to stock.After that use a programmer for fine tuning
11-25-2012, 07:02 PM
#7
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Originally Posted by 74CJ5
After market exhaust or a CAI will help a little. I have both and get 16mpg but I drive 75-80mph so I'm not helping my cause.
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11-25-2012, 07:36 PM
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11-25-2012, 08:59 PM
#9
I re-geared to 4.88s and now I average between 16 and 17mpgs with mixed city/hwy driving 45+ miles everyday
11-26-2012, 11:34 AM
#10
JK Freak
I have an '09 JKUR with an automatic transmission. I'm getting 16-17mpg on the highway and 14mpg around town. My engine and exhaust are all stock, gears are stock 4:10's, no CAI, no programmers other than a ProCal. Just weighed my Jeep the other day an I'm carrying an extra 600 lbs in aftermarket weight, lol. My Jeep weighs 5225 lbs total. You can see my complete mods list below.
Just a FYI for those looking to install stuff to help with gas mileage...
If you want to retain any kind of warranty, just be careful what you install on your Jeep.
Here is what one of the service techs in my area had to say regarding CAI and programmers...
"We can void if we see fit, even when returned to stock theres tell tales that a programmer was installed like mileage and vin mis matchs in different modules etc,
although rare we do see some cai that cause long term engine failure due to more dust injested into the engine...."
Specifically, this refers to programmers that alter the vehicle's horsepower and performance beyond the factory specs. Once you go beyond those factory specs, they can void your warranty if their is damage found as a result. That's the first thing they look at as causing potential problems is all the aftermarket stuff. The ProCal is more of just a recalibration unit so it does not really affect the engine.
Just a FYI for those looking to install stuff to help with gas mileage...
If you want to retain any kind of warranty, just be careful what you install on your Jeep.
Here is what one of the service techs in my area had to say regarding CAI and programmers...
"We can void if we see fit, even when returned to stock theres tell tales that a programmer was installed like mileage and vin mis matchs in different modules etc,
although rare we do see some cai that cause long term engine failure due to more dust injested into the engine...."
Specifically, this refers to programmers that alter the vehicle's horsepower and performance beyond the factory specs. Once you go beyond those factory specs, they can void your warranty if their is damage found as a result. That's the first thing they look at as causing potential problems is all the aftermarket stuff. The ProCal is more of just a recalibration unit so it does not really affect the engine.
Last edited by Runewolf1973; 11-26-2012 at 11:59 AM.