Looks like in the US at least, the original 12C, say a 2012 with up to 10,000 miles ie. 5 year old, is selling for $150-160k asking price.  Original MSRP was I think about $230k, so this is ~65-70% of MSRP after 5 years (obviously a lower percentage if the car had lots of pricey options, but these don't typically result in better resale price).  To me this seems pretty reasonable, and I would guess not that much less than a 458 Italia depreciation.  

But I also wonder if McLaren residual values have as much to do with people's perception of "orphan risk" - will McLaren  stay active as a company that builds and supports their cars, or not?  To the extent that McLaren appears healthy, and is expanding their range (and more importantly their thin dealer network), I think this will help residuals.  


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2011 Range Rover Sport S/C,  2009 Porsche 911S