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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.
Ethanol lowers your mileage, period. Expect a 10% drop in mileage for every 10-15% of ethanol blend. That means a Prius that someone was getting 45-50 mpg (I get 51.7 as a year long average), is now getting 4.5 to 7.5 mpg less.he Toyota Prius is really attractive, and not very expensive. I want to buy it, but I'm a little worried about the life span of a Prius.