I have a 2005 Prius. For three years, I have calculated the mileage on every drop of gas I have used. The 3-year overall average is 51.1 mpg. I have gotten 60 mpg on trips at 45 mph with few stops. I have gotten no less than 48 mpg driving 70 mph. The mileage display has averaged 1,4 better than the calculate mileage. Frank Emerson
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