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I'd like to chip in to say I'm in the process of switching to full e85. Gradually adjusting by adding a higher proportion of ethanol each fillup. Currently on 66% ethanol and no difference in running or starting, but I'm sure the block heaters we use here help. Btw here it's Re85, made from recycled kitchen waste so quite eco-friendly.
With regard to the open loop cold-start/WOT accel. conditions, i believe that at least on my car the ecu uses closed loop fuel trim values to extrapolate the open loop fuelling. This should make it at least roughly correct. I suppose a cheap strap-on EGT sensor could be handy to check all is well. I haven't yet fitted a wideband lambda gauge, but that might also be a good idea.
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