I live in Germany and I have no idea what you’re talking about for the first thing, maybe you mean yield-to-right in unmarked intersections or the priority road system? I’m not really sure. In either case you are just mentally inserting yield signs based on standard rules.
The stoplight thing I feel in my soul though. The amount of times I’ve had to stare out my sunroof to see the light above me because I stopped on the line instead of 20 feet before it.
Depends on the cost of living and state taxes in an area. Usually it’s $3.50-$5.00 a gallon/~4 liters. At the gas stations in Germany on American military bases it’s about $4.50 a gallon right now.