good credit + good (and long) negotiation
It all comes down to negotiated priced + getting the base (lowest?) money factor + getting the most back on your trade in + tax rate in Texas is low (especially considering the trade in).
They promised me base money factor but when I got there the numbers weren't adding up - turns out they <accidently> put the marked up money factor in the system. I had to get to the financial guys computer to figure it out and then they fixed it. Make sure you understand a lease and can do the calculations in your head, if not on your phone/ipad when you go in. My lease payment from their first offer on the car and the final payment I got was a difference of over $125/month.