Originally Posted by bchapman75

I just bought a 1997 F350 with a 5.8 351w. I was talking to a guy that used to have a similar model truck. He said that their is a fuel economy chip that will improve your gas mileage 3-5 mpg. I have never hear of a fuel enonomy chip only horsepower, torque, performance chips. Does anyone know if there is one and who makes them. Thanks for the help.