As the customer you have the power to walk out if the offer presented to you is not favorable. Therefore, once you have presented your offer to the dealer stay strong and hold your ground. Rather than get drawn into a debate, let the salesperson know that you have done a thorough research. However, though it is imperative that you stick to your offer your offer must also be reasonable. After justifying your offer, stay strong. This is crucial since car deals are usually successful and cheaper when you stick to your offer.