My Khyber had 55 Cylinder, it becomes full in 7.5 to 7.8 kg depends on pressure....
on highway once it gave 185KM per tank.. but usually it gives almost 165KM per tank, full empty...
so it gives 22 km per kg.... without ac
and 20 km per kg with ac...
i run always on main roads 90-100 km/h and on highway 95-105 km/h.
On petrol i did not calculate, but my carburetor was not working fine it was giving 10 km/l
but after repairing its giving approx. 12-14 km/l.