Hey Guys,

There's a local station near my office that offers 91 octane with no ethanol. Would I be better off running pure 91 over 93 with up to 10% ethanol?

Just curious.

 

Doubt it if anything the ethanol should help with the octane rating

 

The more ethanol the merrier

 

Octane always is better. I would say that if your fuel sits for a while that the 91 might have an advantage but up to 10% and daily driving should pose absolutely no issues. It gives small engines fits because they sit for extended periods of time.