Maybe a fuelish question?

45Ricochet wrote:

kaydeejay wrote:

agesilaus wrote:
Ethanol gets 20-25% lower mileage than pure gasoline. So if you are burning 85% gas/15% EtOH then you'd get 3-4 mpg less than pure gas. I think that's what the OP was asking.

That's the way I read the question and I agree with the comment.
What Premium does NOT have Ethanol? I thought the Feds legislated 10% in ALL gasoline.:h

We have several stations with premium non-ethanol but you pay a fine price for it. It seems to help the small engines last longer. I run it for the small generator for the house, chain saws, trimmers, blowers, my little ATV Mule and lawn mower.
Generally speaking non-ethanol will get you better mileage but the higher cost would offset that extra mileage.

This is what brought the question up. I buy non-ethanol fuel for my small engines because they sit a lot. Around town the only non-ethanol fuel is premium unload. Treat the fuel with Sea Foam in the 29 gallon TH tank. After a year I pump the unused fuel into the truck. It seemed to run better but did not check mileage.

With the 91 octane over 87 and no ethanol wondered what results others have had. I have always been told octane would not make a difference but the truck did run better.

The truck is a 6.8 V-10.