Thank you for taking that bait. So let's assume you know what this book covers and it only talks about "Average EV" overall that it's some book that only does inclusive work of a certain type motorized vehicle.
You're forgetting the fact to make an average, you have to have a highest number and a lowest number. Providing an average is not a great model for legislation. You should look to standard deviations for that. *Far* more accurate.
Now, let's focus on what KBB actually does, KBB focuses on the average price *per model. Not per motorvehicle type. Otherwise you'd have "Gas cars" and "electric cars" without models. So let's assume that I'm still wrong. That it does *all of this* It *can* lump all vehicles together for each motor type *and* model separately. So, providing an average price for a motor type is disingenuine because it does not reflect the quantity and rate of purchases/sales for each vehicle, such as the ones at the top or at the bottom. So, yeah...
Can you tell me how this book works?