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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.
Of course, you're probably more interested in fuel economy than hp. If that's the case, here are the numbers: The Prius c returns 53 miles per gallon in the city and 46 mpg on the highway for a combined average of 50 mpg. The standard Prius also gets 50 mpg combined, though its city and highway numbers are 51 mpg and 48 mpg, respectively.