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Driving my Prius is cool. Today I wrote down the mpg on the display, the trip readout at the start of the fill to the refill. I can't figure this out, possibly a glitch in the onboard computer. The onboard display read as an mpg of 60.8. The trip read 601.7 miles, and took in 9 gallons. If I did my math right... the 601.7miles/9gallons gives me an mpg of 66.86miles. Is anyone having a glitch in their computer?
 

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Just because you put in 9 gallons doesn't mean you used 9 gallons. The "full" capacity of the tank varies from day to day depending on the air bladder in the fuel tank. A single tank's reading that way won't be accurate, but if you record them and average them, it'll be fairly accurate over the long haul.
 
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