I'm surprised everyone missed my point (also shown in the DVD) that I usually set the stoich point in the calibration BEFORE I begin doing open loop calibration based on wideband feedback. It's not that difficult to get a good indication of your ethanol content before starting. As mentioned above, graduated cylinders are available for dirt cheap. GOOGLE LINK SUMMIT LINK
Once you know what the fuel really is, why not just pick your actual stoich point as the stoich point in the PCM calibration before you start? If you do this, then all of your open loop work will be based around the right balance point and closing the loop should not have any affect as long as you did everything right and the O2's a in good working order.
Don't make this any more difficult than it has to be.
Just for that, I'm getting the hell off this continent and going to Oktoberfest. You guys can argue without me.
No really, I'll be near the Paulaner tent on Sunday if anyone needs me. After that, I'm still wandering Bavaria for the rest of the week to give you guys time to come to your senses.
Auf wiedersehen!