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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 2016 model year Prius has an official EPA fuel economy rating of 54 mpg-US (4.4 L/100 km; 65 mpg-imp) for city, 50 mpg-US (4.7 L/100 km; 60 mpg-imp) for highway, and 52 mpg-US (4.5 L/100 km; 62 mpg-imp) for combined driving.