The Prius II has known issues with the gas tank. The first bar often doesn't disappear for 100 or more miles. The last bar blinks when you can still go another 100 or so miles. This isn't always the case, and it shouldn't be trusted, so we've all basically reverted to the philosophy that it's best to fill up at about 9xMPG. The tank, because of the bladder, probably cannot hold 11.9 gallons after all and 9 gallons is a safe estimate.
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