I noticed the biggest improvement in gas mileage when I replaced the upstream O2 sensor. Make sure that you have good plugs, wires, cap and rotor. My next mod will be an electric fan which will free up some power and hopefully improve gas mileage a bit. Some people also claim that a cold air intake and a throttle body spacer also helps, but I have not tried it yet.
my dad used to average 21 mpg on a tank in his '02 with 28" tires and 3.07:1 axles. he gets 23 in his XJ limited with 3.55:1 and 30" tires.
it's all about how you drive
in my current set up I used to get 19mpg cause I was used to driving a $300 honda i was afraid would blow up if i asked it to do anything; now, with the same set up (real lift instead of bb) i get 14mpg, cause i drive it like i want to drive now and don't have to worry about being sans car cause it exploded.
Jeep: Pioneered by a war, popularized by AMC, revived by Chrysler, jacked by some Germans, and copied by all.
give it a fresh tune up. on mine all i have to do is change the plugs, i have the coils on plugs...
or try a fuel treatment... i was getting 13, just tried a prodect name called BG Products Inc. look them up on the web,
BG 44K® Power Enhancer®
that is what i just used in my last tank. i still got 13, but this tank i am at 200 miles and have a 1/4 tank left.
1977 Cherokee ChiefEdelbrock 1406, 33X12.50, front 1.5 inch shackle lift. AMC 360, th400 Quadra-Trac
2002 wrangler, stock 4.0, auto, 33X12.50 maxis buckshot, AEV Highline Body kit, Ford 9 inch rear end.
Soon to come mods: 4" full traction lift, 4.56 gears, 35X10.50R15 boggers, 35X12.50 cooper st tires, spooled rear end, and much more.
Getting the most mileage out of your fuel has alot to do with watching your tach. If you're driving an auto. watch your tach. closely...when it shifts into 3rd gear, look at your speed also...try to keep your speed just above the point where it dropped into 3rd.
It doesn't take a rocket engineer to figure out that the higher the RPM's in any given gear = more fuel comsuption.
Each man must for himself alone decide what is right and what is wrong, which course is patriotic and which isn't. You cannot shirk this and be a man. To decide against your conviction is to be an unqualified and excusable traitor, both to yourself and to your country, let men label you as they may.
The impersonal hand of government can never replace the helping hand of a neighbor. -Hubert H. Humphrey