Thanks all. It now makes sense to me. When the up counter started and ran to 30, I filled the tank with 20 liters, meaning 5 liters were left. If I ride conservatively I should be able to hit 100 km on this 5 liters on the highway. This info is useful. BTW I re-read the owner's manual and as others stated it is mentioned in there, however the clarity on this forum is far more useful to me. Thanks again.