Using the residual value is a good way of judging how much a car will cost you on a monthly basis because you know roughly the depreciation.
The money factor is a fancy word for the interest rate on a lease. To put the money factor in APR terms, you take the money factor of say, .00152, and multiply it by 2400, which equals 3.648. The number in APR terms, then, translates to 3.648%.
No one willingly pays more for something than they should. But in the world of leasing cars, that can be a hard figure to pinpoint. So what defines a good deal?