I've really been pushing the fuel injection hard as I've approached 50% ethanol.
It looks like my long term fuel trim at cruise is 24.
It also looks like LTFT is incapable of going over 25. Thus, there seems to be a risk of running lean, and pushing the ethanol content much further might not be a good idea.
It's hard to tell what the O2 sensor is going, the Scangauge scales the output from 0 to 100. I'm not exactly sure how to read it. It does bounce around alot. It will be 8 one second, and 72 the next. So I'm guessing that I'm not consistantly lean.