Ehh, I doubt going from 91 to 94 could cause worse gas mileage. The computer will burn it all, but after a certain point, higher octane on a stock compression or non-forced induction becomes pointless after a while since the stock ECU doesn't really know what to do w/ it. Higher octane, anything in the high 90's to low 100's are more for boosted and high compression engines in order to keep it cool. I'd imagine you've got plenty of cool in Canada, so 91 should be fine. With the summers here in Las Boise, I wish I could get my hands on something higher than 91-92 and w/o ethanol, without have to pay over $5 a gallon for it 
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