Flagged? Seems to me it's pretty tough to get around the mpg arguments. Likewise, the wear on engines is well known in the marine environment -- which is not all that different from driving on PNW roads in the winter. Most of our cars ran fine on E0, and I'm not at all sure what you're concerned about in terms of pre-ignition or dual flame-front events (my car, like most, was designed to run on 87 octane).