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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.
Fuel Efficiency: Toyota says the Prius Prime will receive EPA ratings that put it at the top of the plug-in hybrid segment â 55 mpg for the city cycle, 53 mpg for highway driving and 54 mpg combined. With a full charge and a full 11.3-gallon tank of gasoline, range is estimated at 640 miles.