Other Fuel System Tank Mounting problems of the 2009 Toyota Prius

Car exhibits symptoms consistent with fuel tank bladder collapse. Have observed widely erratic fuel gauge indications and difficulty adding fuel - particularly in colder weather, (temperatures below approximately 45 degrees f). On occasion it has almost impossible to add gas to a nearly empty tank even at a trickle as the fuel filler auto shutoff keeps tripping. Attempts to add even small amounts of gas can result in gas spewing back out the filling accompanied by belching sounds coming from the tank. Often the tank cannot be filled to the advertised capacity even in warmer weather. Toyota dealer service denies ever having heard of this problem and has offered no credible solution. On an extended trip this could easily result in being stalled with little warning as there is no reliable indication of how much usable fuel is in the tank or when the fuel gauge is going to quickly drop to near zero. This is also an environmental concern due to emission of gasoline fumes and spurting of raw gas during refueling.