I just picked up my 2012 C III, and I am digging it. I haven't had a chance to drain my tank yet, but I was wondering how much fuel you can actually use... I had a 2007 Gen II, and although it was a 12 gallon tank, I ran out of fuel 2x with it- once when I had consumed 10.5 and once just below 11. I have since read about the issues with the bladder tank, and since I libe in San Francisco, shrinkage isn't a problem- I just assumed that it the system was designed to be very conservative about how much fuel was in the tank. But it looks like that may not have been the case. My ONLY major reservation with the C is the small tank (Why not have a 14 gallon tank and drive 700 miles between fill-ups?!!). If the car acts like my last one, I will need to fill up after 8 gallons or risk a shutdown (and in SF on the hills, EV doesn't get you far). So, has anyone run their tank down yet? And what would it take to replace it with a std Prius tank? Thanks!