I find that people go pretty much the same speed everywhere,
namely what they feel like doing, regardless of the speed limit or the
layout of the highway. I stick to the speed limit or a little under
wherever I am. If the speed limit is 50 mph/80 kmph (such as in New York
City and other congested areas), people fly past me as if I were
standing still. If the speed limit is 55/ 88, fewer people pass me. If
the speed limit is 65/ 104, a relatively small number of people pass.
When the speed limit is 75/ 120, almost no one passes me. In Utah, when
I was doing almost 80/ 129, people were satisfied with my speed.