It is a bit sidetracking...but motards and long distance...
You can tell how impossible it is to my friend - owner of KTM 690 SMR who drove through all Morocco with us and then returned back to Cannes in France doing 1700 km in 18 hours
I do not remember him complaining
It is all in the rider.
690 SMR range is 300 km on the tank. It has really low consumption if properly setup.