Ok guys, data is no good without graphs, and we've had an amazing mix of vehicles (thanks for that - I'm going to keep updating this as we go!).
This is pretty fascinating for me
I've discarded two outliers (people who bought impossibly good secondhand deals), and to try get an 'apples-to-apples' figure I've used a simple formula: (Retail Price - Trade-In Price)/(Time in Months) = Average depreciation per month
NB: New cars depreciate faster than older cars, and a lot of the cars here are secondhand cars (so their depreciation curve was softened by the original owners taking that first knock). To get the 'full' picture, refer back to the original post (number included alongside each car) in the raw data below.
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Moral of the story: buy a budget car and you'll suffer less depreciation, or just drive it for long enough to beat the depreciation curve. That Volkswagen Golf R though, ouch!