[fjfar80]

I will add my $.02 on this one. Since purchasing my truck in 2006 I have always used "premium" fuel or 92+ octane. I have noticed that it seems to run extremely smooth and the one time I used "regular" or 89 octane (due to no other fuel being available) I noticed a difference. The engine seemed a bit rougher and did not seem as smooth when accelerating. Now, the way I look at it the extra $4.00 is worth it when you talk about $.20 more per gallon and 20 gallons going into your tank. Anyway, I have no data to support my observations but; I make sure only the best goes into the truck (oil, fluids, etc.) so, higher octane fuel can't be a bad thing.