Couple of things. Dealers know you're doing this, so they'll try to confuse/bamboozle you to regain their advantage in information asymmetry. You have to be 100

Couple of things. Dealers know you're doing this, so they'll try to confuse/bamboozle you to regain their advantage in information asymmetry. You have to be 100% sure of what you want, and why you want it. The slightest hesitation, and they'll have you. Secondly: this tactic works even better near the end of the month. Salesmen have sales goals; if s/he is a little short of that goal (or the next tier), you bet they'll do everything, including throwing in their grandma, to clinch the deal.