[FrequentFlyer]

520dMT

Now at 4500 miles and have just returned from skiing in Switzerland which gave me a chance to check out the mpg. Over 1300 miles it returned 51.5 mpg driven at 80 mph (130kmh) on Autoroutes for 1200 miles and about 30 mph for 100 miles on twisty Swiss mountain roads.

The max fuel range is 1300km or 800 miles on a full tank according to the trip computer. Haven't done the maths to work out what mpg that gives.

I could have got much more if I drove at 70 (was getting 56 mpg on UK Motorways) but it was a long trip and no reason to make it last longer.

I suspect the Auto transmission is significantly less efficient going through the gears but I would be interested to see what happens when it is up to 80 mph and the long 8th gear kicks in. I was doing 2300 rpm at 80 and I understand that the auto runs at 2000 rpm at 80.

Average over 4500 miles is 48.0 mpg. Average over 90k miles on my previous E60 525dMT (same bhp) was 35.3 mpg. Can't complain at that.