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Here in Ontario, a lot of stations I've seen offer "up to 10% ethanol" in regular (87 octane) gasoline, "up to 5% ethanol" in mid-grade, and "0% ethanol" in pre

Here in Ontario, a lot of stations I've seen offer "up to 10% ethanol" in regular (87 octane) gasoline, "up to 5% ethanol" in mid-grade, and "0% ethanol" in premium.