Of course, some bright spark is going to suggest I change that value on the site, which would be great, if it was a reasonably straightforward thing to calculate your depreciation per mile, kind of like you need a website to do it... Wait.. what was the point of that site again?

Brilliant website that - I kind of lost interest when it used a fixed depreciation per mile...

Apparently, every year I drive my car, it loses twice it's value.