Here in the Midwest as we call it in the States, we get the extreme of all the seasons. It goes from subzero in the winter, to 100 in the summer.What good is high octane fuel in the winter? Either you live in a tropical wonderland and have never seen snow, or you live in a place where fuel is cheap. I live in Canada, where we are taxed to death, that includes fuel as well.
I use 94 octane fuel, only in the seasons where i can use my car for what it is, a high performance car.
That said, the price difference between 87 and 93 is roughly 30 cents in this area (15 cents between grades). This is worth it for all the benefits I listed prior; additionally, the increased MPG makes it a near break even result.
If I can spend 10% more on 93 which comes with a plethora of benefits, and get that large of a FE gain, then it's a question of "why not?"
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