How large is the tank on my 2004 FXDLi and how much fuel remains when the "fuel low" light comes on?

Thanks

 

Fuel capacity: 17.40 litres (4.60 gallons)

http://www.bikez.com/motorcycles/har...rider_2004.php

 

I usually have a gallon easy when my light comes on, and reads LO RNG on the dash. Its easy to test, just filler up and go for a burn and when that light comes on fuel up. She'll take about 3.3 gallons and then you'll know you had 1.3 gallons left!