90 octane non-ethanol vs 91 octane w/10% ethanol.

[Synjar]

Anyone have any data or experience regarding performance and/or fuel efficiency when comparing 90 octane non-ethanol vs 91 octane w/10% ethanol.

I cannot find any non-ethanol fuel with an octane rating greater than 90 near me.

 

[D-mac]

The E0 app shows Wawa stations (amongst others) in the greater Hampton Roads area with availability.
90 octane is the 'premium' grade in Alaska btw, there's no 91 or higher available from pumps. Might be fun to dyno test a LC250 on E0 vs E10 vs the new E15/Unleaded 88 fuel

 

[Synjar]

I certainly recall when E10 became “normal” and it was obvious that I was getting considerably less fuel economy in my boat. If it is true (as surmised) requiring premium in the LC is assisting In boosting Toyota’s overall efficiency numbers and using 91/93 does raise MPGs a little I’d wager using 90 non-ethanol would yield as good if not better efficiency than 91/93.

Thoughts?