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I use premium in my Matrix. The engine has a 10.5:1 compression ratio but Toyota says regular unleaded is fine due to the design of the cylinder head. It seemed more responsive when I started using premium. The deal was sealed on a couple long uphills that always required a downshift. I don't need to downshift anymore. I don't know how it's affected my fuel mileage as I started using premium before I started ecodriving.
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