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Everyone here would agree that the best way to tell what economy a vehicle gets is by logging several back to back tanks. Your tank is small so the thermal expansion errors will be less but they can be substantial in competition for something like an Insight with a 11 gallon tank and such a small amount needed to top off. It works like this. You show up to the competition which starts early in the morning, empty or with a cold, overnight tank. Fill the tank to the brim with fuel out of the ground which is at 10*C. Go to the track and drive your 130 miles. All the while the fuel is flowing to the hot engine area and back to the tank through the return line. You go back to the station to fill up again except you have used 1 gallon out of the tank and now it is at 30*C. That 10 gallons that should be left now measures 10.2 due to the thermal expansion of gas at 1% per 10*C. So the consumption is measured at .8 gallon instead of 1.0. The 130 mpg just became 162.5
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