I keep my bag on the passenger floor, less gravitational potential. Otherwise I keep a hand on it, too distracting. New cars sold in US should have fuel line automatically cut if driven over 100 mi/h or something. I don't know how hard it is to get a driver's license in Germany. Here in US every nut case can get one. I always pay much attention every time I drive. If I drive at 100mi/h I imagine my car will shake too much and fuel efficiency will be half what I get with 65 or70.