On my last trip to gas station, I filled up the tank (2012 EXL) with 20.9 gallons being shown on the pump. I drove about 10 miles since the low fuel light have come on. Though it was city driving, I get around 400 miles for each tank, most in the city.
So my question is that since the tank can only hold 20.5 gallons, and there must be around a gallon or so left in the tank, how come the pump shows 20.9? Is this a trick by gas stations?