if you dont have a stoich setting for it to go off of, you can just bump your injector constant or base injector whateverthehell, its pretty much the same, that's what i did with EE.

drives me nuts trying to get it close here on any vehicle, i have a variation of 0% to 15% ethanol in our local pump gas, which is fine if im near home (i've determined which station is 0% in the premium pump), but if i fill up somewhere else i can feel the difference.

only real solution is to run it a bit rich and just let 'er trim for cruising economy when its running 0%. it's not like it minds a bit of extra fuel in other situations anyway.