How far on reserve 99 fatboy?

The reserve capacity for a 1999 Harley-Davidson Fat Boy typically allows for about one to two gallons of fuel remaining when the low fuel light activates. Depending on riding conditions and fuel consumption, this could translate to roughly 30 to 50 miles before running out of fuel completely. It's always advisable to refuel as soon as the low fuel light comes on to avoid running out of gas.