3.92 gears here too and generally MDS is out of action at anything much over 100 kph - unless the tail end is upwind. Average in town during the good weather is 14L/100km. I've seen 9L/100km on very good windless days @ 90-95 kph. Of course and to add to the advice above, all that goes for a sh_t when the mercury gets close to and below freezing.