Ethanol Free Gas - What's Your Experience?

I'm a former fuel hauler.

E10 will make your engine run leaner with a carb. You can compensate for the ethanol by raising the compression. Look at the E85 race motors. You won't get the mileage. Ethanol has less BTU's than straight gas=less mpg's.

Ethanol gas clouded and eventually cracked the polycarbonate sight glass on our loading heads on the trailers. They would leak.
If you have a carb motor buy fuel injection rated hose at the parts store. Regular fuel line decomposes from the inside with ethanol. Use fuel injection style hose clamps! DO NOT USE A PLASTIC FUEL FILTER!!!

Ethanol is hygroscopic. It sucks moisture out of the air. When delivering fuel on a humid day it is a good idea to cap off the in ground fuel tanks as any air in there has water in it. It will bond to the ethanol and sink to the bottom of the tank leaving the sub-octane fuel by itself. The fuel mixed with the E is sub-octane gas. I forget maybe 76-78 octane. Although the E boosts the octane, it is less efficient in mileage.

Ethanol fuel is heavier than straight gas. This is evident when loading a tanker trailer. You can't legally haul the same amount of gallons.

My Husqvarna riding mower has a Kohler engine. No E10 right on the fuel cap and in the owner manual. Air cooled engines are more sensitive to fuel types and octane. Running lean in an air cooled engine is not a good thing. A liquid cooled engine can absorb/compensate for more heat.

Back when I had a '93 Corolla it had the 1.8 liter engine. High compression 11.4-11.8 IIRC. The owners manual said regular was fine. E10-OK. No E15 or higher. At the time I varied the fuels E10, straight gas, E10 93 octane, and 93 straight gas. For that car no matter what the fuel price per mile came out to $.08 no matter what I ran. YMMV.

When my D350 Cummins was running I got a steady 21+mpg on straight diesel with the cruise set on 62mph commuting back and forth to Nashville. B10 (10% bio fuel) soy oil from the pump it went to 17.8mpg. Biodiesel will clean all of the crud from your tank and dump it into your filters. Bio is higher in cetane rating, also lower in mileage.

Regular diesel uses an algaecide to deter algae growth. I found green pond scum in my filter!