Hmmm... question re price of fuel... why does that enter into the discussion?

Could the octane difference make THAT much difference in efficiency? Now, I am not gonna bother to research it on accounta I don't have a say in the matter and probably couldn't do the arithmetic without a lot more knowledge about the factors necessary to do so.

As for the Canuck ratings, HA! My 2.5 year old Ford gets shit mileage compared to the "ratings" and I drive "easy on the pedal".