I have a '99 LN167r, 5L 3.0L engine, 2" lift, 33" muddies on 15"steel rims, steel winch bar (no winch, triple loop), alast time I paid attention to my mileage per tank it was roughly about 400km per 3/4 of a tank. Only running ths stock 77L tank.
I drive it hard, i have a heavy right boot. I don't change gears until about 3000rpm.
This is all around town driving (Western Sydney), haven't gone on a decent enough trip to work out the difference.
'99 LN167r, diesel, manual, the "MudBug"