I have run mine down to less than 0 miles remaining. It was my last fill-up and it was raining so I kept on putting it off. I ended up getting soaked anyway, it was the day after Christmas. When I filled up, I pumped just over 18 gallons. I think even at the low fuel warning there is over 2 gallons of fuel remaining in the tank. This was the one time I did this, and this was the most I have ever pumped at one time.