The oil change guy tried to get me to let him do a $130 fuel injection cleaner today. He said that my car is way overdue, like 40,000 miles. According to him, gas mileage suffers if you don't get it done. The only reason I considered it is because my wife and I had noticed that the car gas mileage has dropped. I barely trust those guys to change my oil so I'm sure as hell not going to let them do that. It's a 6 cylinder ford Edge. I've seen kits where I can do it myself but, do I really need to do it? I've never had a car with injector problems and have never paid to have that done.