I know if I put in the middle octane stuff in my car it will "knock" (the gas detonates before it's supposed to) and of course my milage goes down too.
There is a station called Centex around Calgary that charges only 6 cents above regular for premium, and has 2 cents off on Wednesday, Saturday, and Sunday. And their prices are also lower, so I usually pay for premium what most other stations have for regular.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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