Real high mileage you guys are getting!
My 2015 GSW TDI S 6 MT only gives me a calculated average of 35 mpg over the 7,200 miles I have put on it.
I drive it fairly torquily and do go up to 85mph stints for brief segments, when need be.
Average drive to work is only 20 miles, mostly highway with a few miles of street lights. My engine not being warmed up for half the drive probably accounts for some of this bad mileage.
My wife has the same car and gets a displayed average of around 46 mpg, but the displays are over optimistic and that would probably only be around 41 mpg at most, quite better than my 35 mpg but far from any high 40s or 50s.
To get mileage into the 50s, I would think one would need to be driving 50 mph in 6th gear, at 1,200 rpm?