The light is an indicator of being on "reserve". Some bikes this is anywhere from a quart to a gallon left in the tank. I have two different Harleys and both of them the indicator light comes on at different fuel levels!
To keep from running out of gas I know I get about 190 miles on a tank on the highway (2003 Road King, 103", S&S570G cams, Ported HTCC heads, 10.5 CR) and about 170 miles on combination riding. When you see the light come on look for a gas station! As sson as the light comes on fill up the bike note how much gas it takes, subtract that fron you tank capacity and you will know how much fuel you have left when the light comes on. Take that "fuel left" amount multiply it by you MPG numbers and you will have a guess as to how far you can go on the remianing fuel.
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