Tell the car salesman you are dealing with that you intend to pay cash for your new ride, and their interest in making a good deal for you will instantly fall off a cliff.
If you have good credit score...take advantage of their currently cheap finance deals to get the discounts that come with them. Then pay the loan off as soon as you can. Last one I did was minimum 6 months at really low interest...then wrote a check for the balance. I saved way more in incentives than I paid in interest. Done that more than once!
