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Unread 09-25-2005, 04:46 PM   #1
CaptainOats
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Tune Up?

I just recently bought a 1997 Jeep Grand Cherokee Ltd (V8). Before I bought it I had it looked at by a mechanic and he suggested I bring it in for a tune up. My gas mileage right now is about 13-15 miles per gallon. If I got a tune up would this help gas mileage at all. Also, would a K&N Air Filter help with mileage as well?

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Unread 09-25-2005, 05:18 PM   #2
Woody
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It depends on how long it's been since the last tune up. You can do most of this yourself for much less than the mechanic will charge. Plugs, wires, oil, these (if worn out) when changed can give you better mileage, but there's no guarantee. Driving style makes the biggest difference.

The drop in K&N made a 1mpg difference in mine, and I never had to buy another filter again. I do have to do the recharge thing once in awhile, but over time, it will save me money. I do have a larger exhaust (2.5" manifold to end) and no cat, so it flows pretty good. All that combined probably made a 1 mpg difference.

You won't see a substancial difference no matter what you do, but you should be able to get 17 depending on your driving habits.
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1985 1 ton K-5, Detroit diesel, 36" tires (going bigger when money permits), 4-speed manual swap, Rockwell T-case, Hybrid lift, 12.5K winch.
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Unread 09-25-2005, 06:08 PM   #3
CaptainOats
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Well the mechanic said it had never had a tune up...and it has a 114,000 miles on it
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Unread 09-25-2005, 06:10 PM   #4
Woody
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How does he know? Was it his? It probably needs a tune up but it sounds like the mechanic was trying to make some money on you.
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1985 1 ton K-5, Detroit diesel, 36" tires (going bigger when money permits), 4-speed manual swap, Rockwell T-case, Hybrid lift, 12.5K winch.
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Unread 09-25-2005, 06:27 PM   #5
CaptainOats
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It wasn't the mechanics car, but he's a family friend. He said it didn't look like it had ever had one.
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