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Unread 08-20-2012, 01:35 PM   #1
GrowlerWJ
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1999 WJ 
 
Join Date: Jul 2012
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WJ Fuel Economy

Hey readers, I recently bought a 99' 4.0 WJ that was horribly maintained by the previous owner he mentioned ''I runn all my cars into the ground'' I know, what did I get myself into.. Anyway, I get like 15-17mpg city and I'm lucky if I get 20-21highway... My moms 00' WJ has nearly 300,000 on it and STILL gets better mileage than I do 18.8-19city 23-25mpg highway... How can I improve this? New sparkplugs, plug wires, fuel filter? Injectors? By the way, I'm a novice mechanic most I can do is change oil and headlights haha, I get all the work done by a family friend at MavisTire (he hooks me up) Am i being irrational about it all or is it fixable? Please, any suggestions or insight will help, thanks guys. -Rob

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Unread 08-20-2012, 01:45 PM   #2
2001WJv8
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you're getting a lot better than what these are rated to get, and your mom's is getting mileage in the "unbelievable" category unless she's using the hypermileage techniques

in short, no there isn't much you're going to do to get better than the above average mpg's you're already lucky to be getting - PO must've really babied it or snuck a 4 cylinder under the hood when n obody was looking
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Unread 08-20-2012, 02:48 PM   #3
notfastenough5
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Many answers you seek lie in the search box above. Hell, type your thread title in there and read on brotha.

Also, I agree with the above post, you have good mileage as it stands.
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Unread 08-20-2012, 03:00 PM   #4
WJlover
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im jealous of your mpg
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Unread 08-20-2012, 03:32 PM   #5
jeepster250
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I get about 19 20 hw 15 city
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Unread 08-20-2012, 03:37 PM   #6
dcocch
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I get 21-23mpg if I drive 65mph. I'll get 23-25mpg if I drive 55mph.....but I get between 14-18mpg in city driving.

A lot of fuel economy is how you drive. Google some techniques. You can manipulate tire pressure, change spark plugs and O2 sensor, use thinner oil (not recommended), take extra weight out of the WJ, increase aerodynamics (reduce drag), etc. You're sitting pretty good at about 18-19 combined though.
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Unread 08-20-2012, 04:21 PM   #7
Geo-Nemesis
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"fuel" and "economy" are 2 words that don't stick togheter when talking about jeeps
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Unread 08-20-2012, 04:26 PM   #8
elcorvino
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Ef You! I get 19.5 mpg all highway driving 55 mph to 65 mph and always on cruise control on flat land.
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Unread 08-20-2012, 10:04 PM   #9
cde02ltd
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Geez! I would be happy with 15, I get 13.8...and it does not matter how I drive. 4.7 ho here, a jeep is not driven for gas mileage...atleast thats what my wife says when I complain about gas mileage. That's why the other vehicle is a MINI.
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Unread 08-20-2012, 10:08 PM   #10
CrutchfieldMark
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I have larger tires so my economy isn't as good as it could be. Yours don't sound all that bad. Is your mom's a 2X4?
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Unread 08-20-2012, 10:34 PM   #11
DustinWJ
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i get 19 in town and like 24 on the freeway with my pig of a stock 4.0 laredo
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Unread 08-21-2012, 12:38 AM   #12
MoparMan1990
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Quote:
Originally Posted by DustinWJ
i get 19 in town and like 24 on the freeway with my pig of a stock 4.0 laredo
Lucky!!! I went 300 miles on a full tank of gas fml
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Unread 08-21-2012, 01:04 AM   #13
Larryftmfw
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Quote:
Originally Posted by MoparMan1990

Lucky!!! I went 300 miles on a full tank of gas fml
Lucky you I get 217 miles on a full tank

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Unread 08-21-2012, 01:39 AM   #14
MoparMan1990
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Quote:
Originally Posted by Larryftmfw

Lucky you I get 217 miles on a full tank

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I need a TPS so I'm thinking once I replace that it'll get better considering its idling at 1000 rpm
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Unread 08-21-2012, 02:30 AM   #15
alfaitalia
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Yawn!!
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