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Been common sense in my house for near forty years. Even get better mileage with one brand over another. Those Gen V DI motors make great use of lower octane fuels to where the difference is not as great, if any, in the 5.3 motors for example.

They became trucks! LOL

https://afdc.energy.gov/files/u/publication/ethanol_handbook.pdf Page 3 or the Introduction explains it, you are correct in most instances. E85 made at the refinery is usually blended with 85 octane gasoline. At my local Sunoco stations, they blend E85 with the 87 octane tank(s) (If they...

Someone mentioned earlier that E85 only goes up to 83% alcohol content. The other 2% is to make the fuel inedible. I forget the name of the additives.

This is the spread on my truck after 5 years and 189 tanks of fuel.

Interesting thread, glad to see other folks experimenting to see how varying levels of ethanol affect their cars. This is 5 years of running varying amounts of ethanol in my FlexFuel 5.3 engine. Sunoco classifies their E85R as 99 octane, so that is what I use when making octane rating...