Again, Moss' data is skewed. And your idea that Missourians might only drive on salted roads once or twice a year is ridiculous. When I was working I drove 22 miles one way on either an Interstate Hiway (I35) or a National number Hiway (69). They get salted if snow/sleet is even in the forecast. Bridges all get salted when frost is predicted. This begins in November and runs thru February. Granted it might not happen as often as it does in Michigan. But don't be na?e and think it's only once or twice a year.
Moss' data is skewed because the majority of State hiways in Missouri are very, very rural. They only get their snow bladed off if it's 6" or more. They only get salted at stop signs/intersections. So the data is accumulated by simple math. X number of miles of State roads. X number of tons of salt purchased. Has nothing to do with where the vast majority of Missourians drive.
Don't get me wrong here,,,,, I am not in any way jealous of how fast you guys can rust out a vehicle. My truck is parked in a heated shop. Never sits outside overnight. I limit my driving on salted roads every chance I get. But I still get on my knees and wash the underside of my truck thoroughly 5 or 6 times during salt season. My 16 year old truck is beginning to rust. Cab corners, rear of front fenders, nothing on rear bedsides yet. I can't wash out my cab corners or the rear of my front fenders. But I can wash out my rear bedsides. Coincidence?