50.9 TDI
in america that is a world record.

No mods at all...
I wonder what they do to TDI for euro. I learned of subarus haveing a smaller version of valves...same engine displacement. In america, they did something bigger, same engines. I ran a rare one for usa, called a DL.
167k miles, 60mpg on the highway... I finally deciphered it. the cams and exhaust valves were smaller...and subaru never mentioned it. there is even a subaru group that has suby experts who did not know about it. Europe could spread some good stuff around.. I would run a diesel. 2.0 euro is plenty.
I am trying for 40 strong (40 everywhere, as average) and that is over double the average for usa.