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In cars that spec premium or in cars with excessive pinging on regular, premium will increase mpg due to timing advance. That's one reason I was glad to buy a car that ran regular. I always cringed at putting premium in my 9-5, but after calculating it out, I came out better financially by using premium.
But again, that car spec'd premium.
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2009 Storm Silver Metallic Fit Sport a/t
2009 Slate Green Metallic Odyssey EX-L
2002 Satin Silver Metallic CR-V EX
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