And I have read where the big 40 ton rigs can hit 22 mpg when cruising in 22nd ! I'll bet that is downhill with a tail wind ! Hard to believe, of course; in real life they average 4 to 6 mpg, or 200 ton miles per gallon and more !
Thus, the most important factor in mpg is the ultra strong Diesel working hard; The six spped, etc, will help a good deal. These are available in Europe, but not third world nations such as the good old USA !!
Lets face it, the Subaru is a gas hog ! As was the old VW beetle under some circumstances..
And I put very little creedence in the EPA figures, I think the European din numbers may be more accurate.