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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.
Most modern cars have gas tanks that will hold somewhere between 15 and 25 gallons. Some smaller cars have 10 or 12 gallon tanks. Bigger vehicles can have larger gas tanks or multiple tanks. The size of the gas tank doesn't have anything to do with the gas mileage.