It's probably indicative of how aggressive I am when I drive, but I have ZERO issues on the highways in Nashville... and I don't know how similar Tucson and Phoenix are, but I was fine buzzing up those highways at 80 mph as well. I mean, if EVERYONE is driving with the same intensity, there are less issues.... people know to get the fuck out of the left lane if they want to drive the speed limit.
It's always the areas *coughchicagocough* when MOST people are driving like they-got-shit-to-do.... and ONE fuckin' nearsighted mormon decides to do "God's work" by playing hall monitor in the left fucking lane, forcing everyone else to jam on the brakes.