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Don't be so sure that your fill up calculations are more accurate than the computer. The Gen2 Prius (2004-2009) in North America has a rubber bladder in the gas tank that expands and contracts to the amount of fuel in the tank. This can cause inconsistencies when fueling up, especially when the outside temperature is different than the last fuel up because the rubber can't stretch as much when its cold. I've had several pairs of tanks where the first one was quite a bit higher or lower than the computer and then the next tank was the opposite. Because of the bladder, you'll probably never have the gas tank completely full. I try to fill up when I get to the last 2 bars.
The computer is usually about 2MPG higher than actual. I personally think its the most accurate reading for a single tank in a Gen2 Prius.
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