Re: Premium vs. Regular?
There is slightly more energy content in regular gasoline, and the Prius is not designed (from what I've read) to take advantage of higher octane fuels, so generally it's best to stick with regular.
Most cars will get improved torque so you can get up hills a little easier or dart off the line a bit faster, but the Prius provides most of that torque from the large electric motor that is unaffected by the octane of the fuel.
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