I just recently bought a 1997 Jeep Grand Cherokee Ltd (V8). Before I bought it I had it looked at by a mechanic and he suggested I bring it in for a tune up. My gas mileage right now is about 13-15 miles per gallon. If I got a tune up would this help gas mileage at all. Also, would a K&N Air Filter help with mileage as well?

I would guess with the K&N filter and a tune up you might get a few more mpg

also get some 8,, tayler wires will help.