Being in advertising and marketing for nearly 10 years, my advice is to think of marketing & advertising from your CUSTOMER's point of view. Many dealerships put their own needs first and sell to customers the way the dealership wants to sell to them - NOT the way the customer wants to be sold to.
Fill the needs of your customers and promote the ability to fill those needs quickly & easily without hassle in a balanced advertising media mix & your dealership will see a successful return on your advertising investment!