Re: What gas do you run or prefer to run?
I don't race mine and generally use mid-range gas. Maybe every other fill-up, and I usually let it get down to a 1/2 tank, I'll throw in premium. Notice no difference in gas mileage or performance, but as I say I drive it conservatively but fast. Ditto for the other two XFs and for my Audi A6 2.7T.