That can be true, but if you're not getting a subsidized interest rate, the difference in interest you'll pay on a new car vs. a used car isn't big at all. Not enough to make up for depreciation.

This is also a good tip -- if you go into buying a new or used car with financing lined up, you can tell the dealer that, but tell them you'll go with them if they can give you a similar rate because you might get a better price.