Thanks for your replies.
I asked the TÜV today and they said that i only can use approved items.
-"The problem in Germany is that everyone looks at you and if they see something they might report it or at least ***** about it to you. Germans are very picky people."
-"The problem is that most German drivers are anti-hypermilers. Vollgas - vollbrems - repeat.
There is a lot of traffic and drivers are very impatient if you go slow. "
haha, thatīs right.
I want to live in America.
Is engine off coasting illegal? I donīt know.
Will pulse&glide really save fuel? And can i really increase to the maximum tire pressure? Wonīt the tire wear down?
Are the items expensive?