Jp'sF-250

I have a 2002 f-250 V-8 motor is there any thing i can do to improve gas milage with out voiding th factory warranty. also what about increasing horse power with out voiding waranty?

 

LunaticSVT

The best thing you can do to improve mileage is to forget about mileage. Its a truck, it gets crappy mileage and always will. Now I am not saying this to be a dick about it. I am being honest. Stop keeping up with it and just enjoy the truck. The best you are ever gonna get is maybe a mile per gallon more if you are lucky.

Enhancements without voiding the warranty. K&N Filter, Cold air intake and maybe an exhaust.

89F150

What he said. There isn't really much you can do to make a significant improvement in mileage. But to make sure your getting the best mileage you can get, you should keep all maintenance up on the vehicle like oil changes, air filters and correct tyre pressures etc.