The maintenance numbers don't make sense to me. I'll use the numbers for Mazda and Mini as examples. They say that over ten years the average Mazda or Mini wil

The maintenance numbers don't make sense to me. I'll use the numbers for Mazda and Mini as examples. They say that over ten years the average Mazda or Mini will cost $7500 to maintain. Both have a model in the top 20 most expensive to maintain with a Mazda 6 being $12 700 and a Mini Cooper being $11 200. Neither one has a model in the 20 cheapest to maintain list so their cheapest to maintain models must be at least as expensive to maintain as the most expensive car on this list. This puts a lower bound of $7500 on the cheapest to maintain car for each of them. How can the average for these manufacturers be $7500 if their cheapest car is at least $7500 and they each have a car that costs significantly more?