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I would use premium gas if the car I'm driving requires premium. If it doesnt require premium, I'd still use it knowing that it is a waste of money. Unless you have turbo/nitrous/supercharger. Then you should use premium, even though the car doesnt require it.
For a difference, I never felt anything different. I did however see more mileage, but it might be because I filled it up all the way.
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