Auto sales are so low that even Toyota has just announced zero percent financing for most of its remaining 2008s. Others, including GM, are doing the same.

Usually the maximum term is 36 months. If you can swing the resulting payments, how much does the zero percent financing save you?

You can actually find out using TrueDelta’s Vehicle Price Comparison Tool. Just compare a model with itself. Then, on the results page, you’ll see a box to convert the results to payments near the bottom of the page. The lowest rate available is shown in that box. Select zero percent for one of the cars and the rate you can otherwise get for the other, and simply hit the button.