[Merl]

Hey stoneage you dont HAVE to use the premium fuel. Gm made a deal with with gas companies and told people to use it. Only use premium if you hear knocking, and only if the knocking bothers you, because the knocking wont hurt your car. My grandmother does taxes for a guy who helped design the early 90's cadillacs, and I talked to him because I have a 93 sedan deville, and told me you can use low grade if you want to and it wont hurt your car. I personally use medium just in case.