Does anybody know what effect the temperature has on the gas tank capacity? I currently have 5,163 miles on car. Filled up yesterday with two bars still showing on the "Guess Gauge" and it took 11.338 gallons. The outside temperature was about 79 degrees, and I had 539 miles on the tank and was concerned about running out. Back on February 9th when it was a lot colder (in low 40's) I had 545 miles on the tank and put in 11.117 gallons. At that time the guage was on the last bar , and had started flashing about 15 miles after it dropped to the last bar, and I also got the re-fueling message request on the screen, which was only about 1 mile from the gas station where I filled up. On all the occasions I have tried to fill the tank when car was on level or leaning slightly to the left. Also, I lift the nozzle almost to the hole cover and gas slowly until it starts to gurgle and bubble at the top of filler tube cover. My total milage to date is 5,163 and I have used 112.047 gallons for average of 46.0789 MPG. Has anyone else been able to get more than 12 gallons in the tank? I believe there was a message posted where someone put in 12.4 gallons. In other words, in hot weather when the bladder expands, is the capacity higher??? Thanks for any help because I don't want to run out, and I have been watching the milage closely. I can't quite figure out why it took so much gas when the temp was up. The monitor was showing about 53Mpg and I only got 47.54, however I did run the air conditioning on about 1/3 of the mileage on the last tank. Back in Feb when it was cold I got 49.02 mpg.