I found on my 2005 Prius that the gas nozzle will shut off about 2 gallons before the 11.9 gallons is reached. If I very slowly fill after that so the nozzle doesn't shut off, I can get the additional 2 gallons in the tank. There is a danger of sometimes over filling and spilling a small amount. Has anyone else noticed this? Does pressure build up in the bladder tank that causes the nozzle to shut off? Did I see a post that the fill tube has been "made more flexible" recently? Was this the reason?