I only get about 300 miles on a full tank of gas and the gage reads empty and the warning light comes on â€¦indicating that I need to get to a gas station soon. . However when fill up it only takes 7+ gallons.. in other words, I still had about 4 gallons in the tank, and at an average of 45 mpg I should be able to go another 200 miles (approximately) but the gage was reading empty and the warning light was flashing. I went to the dealer to ask them about this problem and they say it was normal for the Prius because it had a bladder gas tank and it depended on the atmospheric pressure, temperature etc. Have any of you had a similar problem?