So I dediced to start a thread on most mileage on a tank of fuel and maybe most gallons on a fill? Today I am going to attempt to get 500 on my tank. Top off the car on mondays before going to work and have been trying to get 500 out of my tank. My first light clicked off at 93 miles and I am averaging 25.4 mpg. I have 100 mile to drive today and have some hills to go through with 3/8 of a tank. Its goin to be interesting....