I have purchased three new cars with 0% - they were advertised at the time, but one actually was not. I had negotiated and got it down to the price I wanted and the dealership was closing for the night. They relented and gave me both 0% (newer vehicle year vs the end of the last year's model) and let me put a larger down payment than they typically allowed on a CC that I got cash back for. Now - they had made a mistake earlier because they had said that 0% was for the upcoming model year, so it was really an error on their side and I think that's why it worked in my favor. I was in my early 20's at the time, so honestly no idea. They may have just wanted to secure the sale for all I know.

Good credit and low debt-credit ratio is really what you need. I have never paid sticker price for a 0% vehicle either - I enjoy the negotiation part. Even got a 2016 Corolla (when new) for $3k less than sticker with 0%...even with tax/fees it didn't come close to MSRP.