I'm everyone's been asked this question at least once. But seeing as how most engines made in the past decade are engineered to take both even though a lot of them recommend using only premium. So whats your 2 cents about about this topic?
I've been running e85 not much mpg difference,I'm going to try 91 next tank.E85 was $1.15 per gallon cheaper than unleaded today. I filled up my van on e85 for the first time. I'm down less than 1mpg over 130+ miles so far.
Have you noticed any knocking while using regular? Just asking because premium is recommended for the turbo.I have a turbo .. use regular all the time. Took it on a trip .. kept the speed around speed limit and got close to 34 mpg. Granted it was flat driving with the only hills being the over passes over roads.