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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 gas tank on the 2006 Toyota Prius holds 11.9 gal.. Edit. Share to: 1  Auto Adviser: the Prius V When Toyota introduced the Prius worldwide in 2000, it quickly became the standard for all hybrid electric vehicles.