hey guy my name is pop i just brought a 1997 gmc yukon 5.7 4wd with 125000 miles on it. Im looking to improve my pedal responce and figure out a way to improve mpg by lets say 5mpg. Im a strong about only putting high test gas in the tank and also put fuel cleaner in so i know that gas in always burning clean. Let a rookie know some good idea's and the cost of the idea thanks.