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Old 11-19-2009, 01:25 PM   #1
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Gas Mileage

has anyone improved gas mileage for the 4.0, its auto, by adding
a aftermarket part to engine, a couple of MPG would be fine.
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Old 11-20-2009, 09:04 PM   #2
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diminishing returns.....

have to watch your driving behavior and keep your jeep in top maintenance condition.

I am removing all unneccessary weight (maybe will help?)... but most of the gas waste is just sitting / idling that I notice.

A 30 minute trip today I spent 10 minutes stopped according to my Garmin GPS trip meter.

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Old 11-21-2009, 02:02 AM   #3
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Re-gearing. Tires. Lead foot.

This doesnt have to do with the engine BUT it does have to do with gas mileage

As far as engine goes, i dont believe in throttle body spacers, or putting "newer year intakes" on older engines stuff.

Just a good air filter ( K&N etc.) and exhaust to match it.
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Old 11-21-2009, 11:52 AM   #4
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yes, i guess a jeep is what it is, good tuneup, and i think ill go with that
K&N filter, thanks for replies
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