I still don't believe you're from Germany because:

1. Most roads are not autobahns. Implying you aren't familiar with speed limits as a German is akin to implying an Italian wouldn't be familiar with level floors.

2. The autobahns themselves are only limitless in rural areas, and even then a lot of vehicle types are still subject to limits.

The only thing I see indicating you're actually German is your sense of humor.