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
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
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.
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.