Up north here due to the climate and road salt vehicles tend to rot out pretty fast and it's a lot more densely populated so we probably don't put as many miles on. I've got 48k miles on my 2003 truck and it's used year-round. I don't think I'd ever reach the break even point on the cost of a diesel truck over a gasser. And what's the point of having an engine that will last 3 times as long as the truck it's in? Where I am it's not like diesel is on every corner either. Yes, there are people who run diesel trucks here, but it's not very common.