i don't think i was clear enough about ethanol. As i said i tried both ethanol free shell vpower and the 10% ethanol containing petro canada 87 octane and i saw no difference in mileage or power. The only difference was the car running slightly lean above 4000rpm with vpower (i think 11:1 vs 10.8:1 at 6000rpm). Also i have been running 10% ethanol 87 octane gas in summer time with no issues, scoring 33mpg highway and 24mpg city consistently. Now my problem is the winter gas, it just seems to evaporate in there. about 18mpg city and 26 highway. it seems i'm right, according to petro canada's website:
http://www.petro-canada.ca/en/wholesalefuel/318.aspx
Quote:
It (winter gas) evaporates more readily than summer gasoline for improved cold weather start-ups.
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