I have both the 5 spd and the 6 spd version and the 5spd is the most economical at 105-110 where the 6spd is the most economical at 120.
I managed to obtain 5.8L/100 in the 6spd one the other night coming from south of JHB to the north of Pretoria.
I reset my consumption the moment I got on the highway at Beyers Naude, and stuck to 120 on the level surfaces, going up to 129 at the bottom of the downhills and only allowing it to drop back to 115 on the peak of the uphill. The journey was 85km long. No traffic, and no AC because it was rather cold.
The key is a steady foot.:rollsmile: