So it being the winter, I usually don't run my car down to empty, but I did the other day because I was running a ton of errands. This was the first time I've gone down to the gas light in my xB. When I filled the tank, it only took 12 gallons! I thought xBs had a 14 gallon tank, right? One of the nice ancillary reasons I bought it - so I could fill up less often than when I had my old 12 gallon tank car. Is there something I'm missing???