my '13 Rio SX has a problem. I fill up the gas tank when the light comes on and my Miles to Empty says about 65-70. The problem is when I fill up my tank as this point the pump will shut off at 8 gallons when the capacity is 11 gallons. I'm averaging 35mpg but am only getting like 280 miles out of a tank. This doesn't sound right... Anybody else notice this?