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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.
The Prius gets relatively poor mileage until the engine warms up. This takes about five or six miles. During this warmup time, it gets about 35 to 40 miles per gallon. If your driving consists of purely short, say five mile, trips-you will not get 50 miles per gallon.