I was renewing my insurance on my 2008 CLS 63 and the agent said the current book value (trade I guess) was just north of £12k, Shocking... It is 7 years old has 48k on the clock and looks like new. Its has most options fitted and the original price was £83k so that is £10k a year or £1.45 a mile depreciation. I was considering trading in for a DB9, but at that price I think it makes it a keeper!