I don't believe that 'new' or 'nearly new' makes a difference, as a rule. It's all relative and depends entirely on how good a deal the 'new' car is. Bear with me...
The 'nearly new' car lets say, costs £7000, it's 6 months old and a couple of thousand miles. You pay cash, drive the car away, round the block and decide on the same day (ok, this is just hypothetical) to trade the car back in. You visit the garage and they give you the trade-in value. --- £7000? No, probably more like £5000. That's a loss of somewhere in between 28 and 29%.
Now, let's say the same dealership have a 'new' variant of this car for £7500. How does that make such terrible sense in comparison?
I'm not campaigning for people to buy a new car, merely suggesting that unless you buy a classic or a "couple of hundred quidder" then it's going to lose lots of money. The thought that new cars lose a 'percentage' is wrong, it's the difference between what you paid and it's trade in value - This doesn't always mean you will be better off with 'nearly new'. You can only compare the facts of what is available New and Nearly new - and what they are costing at the time.
Telling yourself New or Nearly new makes a big difference when it comes to losing money is naive.
JJ
You gotta tie yourself to the mast my friend, and the storm will end.