Easy answer....I put almost 20K on per year. Leases work best at 10K, well at 12K and just OK at 15K. Much over that they can get expensive. Plus when you turn the car in, they have the right to charge you whatever they want for "excess" wear. That can be a scuffed area on the diver's seat, a rock chip, or even light wheel rash......not just the obvious stuff.