My nerves are not made for that sort of adventure so I usually fill as soon as possible after it comes on. I read somewhere that both the XT660Z and XT660ZA have over 5 liters of reserve fuel. What I would like to know is if that reserve fuel is from the light comes on, or if there is actually a fuel reserve when the main tank is empty. In my teens I used to have a moped that I had to turn a lever to use the reserve fuel. I guess it's not like that anymore?