Originally Posted by SHO_91

An old and cheap trick for cleaning gunk out of the engine internals is to add 1/2 qt of tranny fluid to your engine oil, shortly before changing it (I do it 1x/year, about 300-400 miles before changing. I drive upwards of 35k miles per year). Won't save a lot of gas, tho.

Originally Posted by captainofiron

did that and then realized it was a bad idea, my Jeep started leaking engine oil all over the place, since then I changed the oil pan gasket the rear main, the valve cover, and it still leaks sometimes

Originally Posted by SHO_91

There are several techniques to max fuel mileage, unfortunately, you'd be driving the thing like a granny. Quality fuel, ignition system in good wroking order, good O2 sensors, non-binding brakes, properly inflated tires, everything lubed are pre-requisites. You could use synthetic engine oil & tranny fluid to minimize friction. I like driving stick, it's better on gas, my '96, however, could use a 6th gear. Further, any performance upgrade, such as CAI, larger throttle body, turbo, S/C and the like, uses more gasoline.
Then there's driving style: Stay at or slightly below speed limit, avoid sudden changes of the go-pedal, try to approach a traffic light without much braking so as to shift down to the highest possible gear without lugging the engine (1500+ rpm), try to park in such a manner that you can take off without having to back out, AND, generally, your fuel consumption is proportional with the distance of your right foot to the floor... I have heard of people getting 45+ mpg (Honda Accord) or 50% over EPA rating by driving like this.

Originally Posted by SHO_91

Sorry to hear that. Still, I'm not entirely convinced, it was the tranny fluid. I and a lot of my friends do that regularly, with no ill side effects. It's been around for ages, just don't leave it in for an extended period of time.

Originally Posted by sexy_hotfootball_stud00

the only reason performance upgrades would rob gas mileage is because when you do the upgrade, you like to use it and feel the difference. adding horsepower decreases the stress on the engine to move it. but when you add horsepower and tromp on it, yes it will use gas more

Originally Posted by azxj99

im shocked no one has mentioned a programmer for fuel econ. they can add hp but can change shift points for autos. Driver number 1 cause for bad fuel econ. trust me, after my speeding ticket ive gone from 12 to 28 mix of city, highway and 4x4

Originally Posted by FrenchXJ

When I got mine, my better tank was 14 MPG... 3.07 axle, 5 speed, and original tires...full stock with 100 000 miles...

Now I got a 3 inches lift, 235/75R15 cooper 8x15 wheels. BBK valve body, 3 inches exhaust, no cat.
engine oil changed, new plugs, new wires, caps and rotor. new injectors.
did grease all the point springs to wheel bearings...

I got 105 000 miles now, and i did 350 miles for the best, and regulary do 290.

will get rid of the macanical fan, new transfer case and axles oil changed asap, and as many person already told, the driver is the first responsible for a good fuel economy...

Originally Posted by Tural

sent my hypertech max energy last week. i'm an mpg freak, so i analyze every aspect of it. for $380 didn't even get 1mpg. smoother acceleration though.