Nice i've had similar experiences my best tankful was indicated at 6.1 liters on 100 km.
Drove from Douglas (Northern Cape - about 100km west of Kimberley) to East London (Eastern Cape - between Port Elizabeth and Transkei) today.
I drove Douglas - Kimberley - Bloemfontein - Aliwal North - Queenstown - East London.
There was numerous Stop and Go's and plenty roadworks that killed my average speed but none the less, these are my findings as I pulled up at the house.
Fuel in the tank is Caltex 500ppm + 500ml 2 Stroke Oil.
This car is awesome!
As an added extra. Look how clean the oil is 2000km after it's last service!
Karma's Law - For every action there is a multiplied reaction!
1993 Mitsu Pajero GLS 3.0 V6 LWB - SOLD
2000 VW Passat 1.8T - SOLD
2001 Gen3 Pajero Di-D LWB