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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.
I was expected to put around 7 gallons according to the Prius MPG instead it went way over, 8.16 G for 323 miles. My quick calculation, it came out 39.58 MPG, way lower than 47.6 MPG on the screen. Perhaps my dealership didn't put the gas all the way up. haven't put any gas in my car since I picked it up last Saturday. So far I put about 320 miles on it. And the MPG came out much better than I expected since it was about 70% highway, it's 47.6 MPG. According to this reading, I already spend 6.72 gallons, if the reading is correct.