Me too.I gave up depending on the low fuel warning light. It's too inaccurate if you ask me. I do what others have said, I use the odometer. Every time I fill up I reset the trip odometer to zero. Then when I get to a certain amount of miles I know that I am pretty low on gas and refuel.
Just wondering if anyone else has an issue with the "low fuel" light coming on when there is more than 2 gallons left in the tank? I have a 2009 Sportster Low. If I fill when the light comes on, I put in about 2.5 gallons in a 4.5 gallon tank.