See, it doesn't seem to work that way. It seems to take unburned fuel into the equation too, which is messing with my results.

(I can't edit my post? o.o) Therefore, it thinks my bike has used 14 more litres than it really has. Maybe I'll manually correct this with a 0litre fuel up, if that works.

I just created my account. My car is new. The fuel tank capacity is 55L. I've added the initial fill at 0Km, 55K, then my 2nd fill, 42.3L at 570KM odo. My reading is saying 0L/100Km. What am I doing wrong?

Ignore my previous question... I fixed the issue by changing the initial fill up at the dealer from millage 0 to 5. I suppose the value of the odometer has to be bigger than 0Km.