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My "by-the-numbers" response:
1) I totally agree, ethanol is for sipping (whiskey), not diluting gasoline.
2) Older engines cannot detect and adjust A/F-ratio to accommodate E10 fuel so almost universally loose MPG with E10 fuel.
3) Newer engines CAN detect and adjust A/F-ratio so CAN accommodate E10 fuel such that they often do NOT loose any MPG burning E10.
4) Power-hungary drivers LOVE E85 fuel because it UPs their engine's HP output (but simultaneously DROPS their MPG numbers drastically).
5) E10+ fuels (gasohol), IMHO, should only be used during "emergencies" such as OIL embargos and natural disasters, where "something" is better than "nothing."
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