Note also that the rate for the extra KMs is pretty high. Here in Canada, if you pre-pay for mileage, it is 0.15$ per KMs.
I'm thinking about renting one CT with the thechnologie package with 40k KMs per year, I use it for my business, and the buyback price is of approx 6500$ after the 48 months. There about 9600$ only in extra KMs.
So just make sure to know the price for extra mileage not prepaid.