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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.
Three. In the 2001 to 2009 Prius, no better gas mileage was measured for any gas other than the 87 octane (from a reputable station) recommended by Toyota. There is some evidence that high octane produced more power in hill climbs.ong term, use high quality 87 octane gas from busy stations. And the only fuels to stay away from are not gas, do not use diesel or E85 in a Prius. Hy-Bird said: â. I always thought the higher the gas the better it burn in the tank.