Look and treat the customer the way they want and in a way that reflects the quality and brand of the car.
Find their hot button. Ask three questions:
With these questions you can interpret it as:
Prove to me that automobile is dependable.
Convince me that price reflects the price I'm paying for a Merc
Assure me one less thing to consume my valuable time.
You're not only selling against competitors, but against the other options available for the money like a holiday, boat or cruise, etc.
If Performance is the customer's hot button, your entire presentation should focus on how various features of the car align with that need.
Depending on your personality, if you start walking and say "come one, lets go for a drive", without waiting for a response, they'll most likely follow you for a drive. If they don't, you haven't maintained control before.
The salesman takes the car for a drive first and show it's various features. Make the customer feel at ease and talk to them about non-subject things. After 5-10 minutes, you can ask them how the car feels. Make them the feel comfortable in the car and picture themselves in it.