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I also think, and have had the reason explained to me once, that it also depends on the altitude at which the car is operating. At higher elevations like Calgary or most of the prairies, 91 is good. For lower areas such as Vancouver, something like 92 is better. With that having been said, when I'm in BC I always fill up with 94 from Chevron.
Last edited by Canada Kev; 07-18-2011 at 01:21 PM..
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