Ya you might get like half a mile per gallon if you throw exhaust, cold air intake, programmers, whatever else you can think of, on it. Not worth the money basically. It comes from factory tuned as good as it's gonna get. I've heard an LS1 will get you about 29 mpg tho.
I'm right there with you tho. I sold my 34mpg civic for a 15 - 17 mpg jeep... but I knew the trade off, and it's definitely worth it!
Edit: oh ya... turn off a/c and defrost as much as possible
use throttle body spacers, premium gas, install a home made hydrogen fuel cell, run synthetic everything.
hahahaha just kidding none of the matters.
Honestly it comes down to good driving habits, dont accel over 2K rpms (auto, bit higher for manual) try to coast to red lights instead of accelerating and stopping right before it (I call it timing the green lights haha) Trade your heavy *** 33's for some 30's or smaller, get rid of the BB to increase aerodynamics.
Honestly back when I had everything stock (29"). I got like 22-23 mpg now I get like 18 hwy with 31" BFG AT
If you really love your jeep and dont want to sell it, go back to stock
Jeepin isn't a hobby, its an obsession
i get between 225-260 miles per tank and I thought that was really good. It seems that air resistance is the jeeps biggest enemy. I would advise driving a few mph slower, and less acceleration to improve mpgs...
I average around 20-23mpg in mine but it currently still has the stock rims and tires on it and the max speed I can really drive is about 60mph and relatively flat since I live and work on the outer rim of the island. Good gas mileage is simply not what a jeep is good for, that's why I try to take my motorcycle whenever I can.
08 Unlimited Rubicon 6 speed, 315/70-16 Kelly TSR, 1.5" Spidertrax spacers factory Moab's, Rubicon Express Flex arm 3.5" lift, Smittybilt XRC front bumper with D-rings, Body Armor Extreme rock slider steps, AEV snorkel, trimmed fender flares, Hella 8" HID driving lights