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He is saying the left over petrol will cause it to read a lower ethanol content which will make the sensor wind back the tune (reduce timing) even though the contamination is so little it won't effect the knock resistance of the e85

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Can't be bothered finding the paper, but basically for port injected engines of our vintage there is no additional knock benefit past E40. So really your timing map should alter from E0 to E40 and your fuel map should alter from E0 to E100. I bet the Wolf (like most others on the market, to be fair) isn't smart enough to do this. So rather than make a video about it they could improve their ECU to solve the problem they are talking about.

OTOH, because the ignition map is still scaled to E100 same as the fuel map you lose out on a little bit of ignition timing if you are swapping fuels. Big deal. You're in it for the convenience, right? You still get it, right? Who cares!! The people who are in it for the last 1% of performance are running full E85 conversion, not flex.

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