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      06-23-2009, 07:44 PM   #2
J08M3
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Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

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Did you give your ECU a chance to adjust to each octane change before the dyno? I think it takes about a full tank of gas of a certain octane to do that (so I've been told on here). In which case how could you do this in one day? If it's more than one day between runs you could easily see +/- 5 hp just by the weather that day.
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