When I stick it in my '02 BMW I don't go above a 25% A1/ 75% diesel mix and it runs fine!
I'm sure you pay the excicse man the extra duty as well
Anyway, I was going to clairify my original statement by saying that you could add the extra lubricity enchancers which modern ULSD has, or you can modify the engine like the Thielert or Austro engines.