Regular or premium
I know that Chevy recommends premium gas in the 6.2L engine. What do all of you out there use? Is using regular a bad idea?
Forum Discussion
time2roll wrote:
I would use the minimum recommended octane as specified by GM.
My 1970 Mustang required 98 Octane and best available was 94 then 92. Probably ran a lot better in 1970.
The R+M/2 rating system is what changed, current premium is about the same octane as before 1970. Of course the ethanol causes higher consumption and the lack of lead causes more valve and valve seat wear.
