Oh yeah you can put one on a gas engine but how they do on fuel mileage i really don't know. I work at a Chrysler/Dodge dealership. I have wondered how they help on a Diesel with all that black smoke myself. A Diesel blowing black smoke is just unburn't fuel, Too rich. But remember too lean and you will melt that engine down :!: :!: Right now engines are running as lean as they can thanks to our wonderfull federal Goverment :!:
Mark