I've been checking the big insurance auction sites like SCA and Co-Part for the past couple years and have been impressed by the sheer numbers of totally wrecked old cars that appear each week. For example this 55 Chevy. How do you wreck a car so badly? https://www.copart.com/lot/45848179 or this 55 DeSoto that looks to be the victim of a falling tree. That really sucks! https://www.copart.com/lot/51567589 Or the many, many burned out cars like this 30 Model A. https://www.copart.com/lot/57375319 I started to think about this and I realized I didn't have any real idea of how fast old iron is being lost this way. This way being fire, collision, act of god, foolishness etc. We see old stuff resting in junkyards, barns, garages and pastures and worry that it will rot away or be sent to the big shredder. It's apparent to me that stuff is disappearing at a faster rate than I had thought. Does anyone have a formula to calculate this rate of attrition? I'm not sure how you would do it.