I think the fuel light will come on at different times due to the positioning sometimes. Its the same in some cars if your on a hill the fuel light will come on and once you hit level group it will go off.

But the XT's light is suppose to come on when you have 1 gallon left in the tank. But ive also had the light come on and filled it up and found only got 9-10litres in.

__________________
Plough on