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Tagged: 0 Thread(s). Quoted: 0 Post(s). The Prius gas tank is fitted with an internal bladder to prevent gas fumes from leaking into the air. It does create the problem of inconsistent gasoline fill-ups. 1 - The back pressure from the tank can cause early shutoff of the nossle. (don't overfill as gasoline can spurt out due to bladder pressure). 2 - In cold weather, the bladder gets stiff reducing the effective tank capacity. As was stated before the nominal tank capacity is 11.9 gallons.
It s pretty rare for us to get even 9 gallons in the tank. Of course we don t let it go empty. The prius gas gauge has 10 bars. When you get to the lowest bar after some more gas is used it will start flashing. We rarely let it get that low, but we have. Even then I don t think we ve put 10 gallons in.