No news or point, really, mentioning this, but recently refueled with a mixture of 14 gallons of regular and 4 gallons of E-85.
There's a station called "Conserv" in Santa Monica that's the only place in the Los Angeles metro area that sells E-85 -- so, that's where I went.
Why? Boredom, really.
Figured I'd try a few gallons of the E-85 and maybe at least clean out the injectors. Then go back, full-time, to 100% 87 octane.
Resulting fuel mixture is currently, probably in the E20 - E30 range, I guess. And the 4Banger seems to run ok on it.
But, like I kind of said, it was a one-time experiment born of boredom.