I agree with you that Americans don't know how to use lanes, but I want to push back on the cruise control comment. Many cars have cruise control set differentl

I agree with you that Americans don't know how to use lanes, but I want to push back on the cruise control comment. Many cars have cruise control set differently, and "keep the speedometer at exactly X" is not the algorithm generally in play. I was once part of a caravan with a sedan, pickup truck, and 15 passenger van where we all yelled at each other for not using cruise control until we realized that we all were using cruise control the whole time, but needed to adjust it to not interfere with each other on hilly roads. If you want the best highway fuel efficiency, programming a cruise control to slow down uphill and go a bit faster downhill is the right way to go. How much faster or slower depends on the engine and current weight of the automobile, which is why the three examples were so wildly different.