I have an automatic 2015 Mirage DE. I've noticed that on the last few fill-ups, my fuel gauge was close to empty (one or two bars), but I was done filling after 5.5 to 6 gallons. The tank holds 9.2 gallons, correct? In that case, at one or two bars I'd expect to fill up to 8 gallons at least. Also, my MPG since the last fill-up is 45—which means I should get approximately 415 miles on the tank. However, I'm down to the flashing single bar after 280 miles.
Is it possible that the gas gauge can become "un-callibrated"?