The items I think of right off the bat are as listed above a better intake system and a less restrictive cat back exhaust, which will allow the motor to breath better, and good quality synthetic oil which should decrease friction, heat and reduce wear, reduce vehicle weight by removing the third row seat if not in use, tow hitch package if it's not used ect..., reduce drag by removing the roof rack cross bars, now with all this being said don't expect to set the world on fire with massive milage gains, even if you did all of the above I would think the gains would be minimal but I will say without a doubt that the vehicle wil perform better, 15 to 20hp, and provide you with better milage if you can stay out of the throttle and stay on the highway. Good luck, Todd
Everyone seems to be getting better mileage than me. I live in So Cal, so the highway speeds are either 15 mph (when crowded) or 80 mph (normal).
I also have the cast 5 spoke aluminum 17 inch factory wheels, and I am wondering if this is affecting mileage too (in addition to my natural lead foot). Does anyone know weight comparison of the forged chrome six spoke factory wheels?
'06 Commander Ltd, 5.7L Hemi, QDII, Midnight Blue, Gibson Exhaust, Raingler Net, K&N FIPK, Remote Start, Optima Yellow, Skid plates & Tow Hooks, Rocky Road 2.25 Lift, New Rear DT Shocks, 265/70R17 REVO's, 6061-T6 Custom Wheel Adapters, 4xGuard Rock Rails/Steps
'05 Land Rover LR3 SE
WOW 19 mpg i did the same thing, tried to keep the tach at 2k (altho i know rpm's dont really have much to do with milage, its the throttle) and it did help a lot. 3 days of keeping revs at 2k bumped me up from 14 mpg (on the 3.7 isnt that crazy) to 18 mpg. but it sux driving with rpms at 2k all the time hahaha
My point is why would you get the smallest engine option in a full size SUV and expect to get good gas millage? A smaller engine needs to work harder to move the weight around, so you can't expect to be getting 20mpg or better.
2005 LJ Impact Orange 4.0L Automatic (Tigger) - new ride
1991 YJ Sahara 4.0L Automatic
1978 Dodge Lil Red Express - work in progress