No experience with a Prius, but my 97 corolla gets around 17-22 mpg within the first 5 mins of driving (40-45mph), at about 15 mins I hit 30mpg average and driving 55-60mph at night (need to learn to leave earlier lol). Trip average for country driving is around 40mpg, summer is around 44mpg. All readings are from a calibrated scan gauge.
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