I think HD has the fuel gauge reading empty before the fuel tank is actually empty. Ever since HD eliminated the petcock which had the on/off and reserve position they had the fuel gauge read empty when you really had around 1 gallon in the fuel tank. They did this to bring your attention to the fuel level since you don't really have a reserve. When my bike reads empty I have around 1 gal left in my tank.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.