When buying new Honda or Toyota always ask for 0% APR, i've done this 2 times. Second time i called Honda over the phone asking if they had any new car of my liking, they gave me a price and i told them i am interested only if they offered me 0%APR. The representative told me they dont have that offer right now, so i said fine i got 0% offer from Toyota.
Tell them straight up i will buy the car only if i got 0%APR or i am taking my service to the nearest competitor. As a matter of fact this same tactic worked for my family friend as-well. But you better be a good negotiator, no guarantees but worth a try.