Really?
Don't believe all you read about "German made" automobiles!
True they are big on biofuels on Europe mainland. The problem is when tankers and transit pipes have been used for diesel and then switched to aviation kerosine. That is where the problem lies. Only needs a few spores of this plant life to start a colony inside the airplane tank.
The other issue is rubber attack. The bio content rots rubber.
Love the way these threads go on and on and on!