most gasoline available in the eastern USA is E10. I go out of my way to get E0 for a vintage high-performance vehicle I drive on occasion, it's noticeably happier without the ethanol, even if it can drive on E10 without damage.
Close enough. E10 is enough to see most of the issues you will see with pure Ethanol. Most engines just need to run is different fuel maps. ideally you would make other changes (increase the compression ratio), but they are expensive.
