Joe -- isn't small subjective? <smile> Not all dealers share their data with me. But I can tell you what I have.
Dealer in Iowa - 44 vehicles, average price is 13k, 17094 VDP
Dealer in Oklahoma, 40 vehicles, average price is 12k, 16501 VDP
Dealer in Washington, 25 vehicles, average price is 13k, 8952 VDP
My VDP count ranges from 3,400 to 46,000, with car counts for dealers from 7 (yes I do REALLY small dealers) to 186. Even the dealer with 7 cars got 3700 VDP!
We test, launch, rinse and repeat...over and over - until we know what works for you and your dealership. Which is the same thing any of you are/should be doing. Tracking and monitoring for the best results. Price or no price, title header?, custom template or plain vanilla listing?...you need to experiment and see what works for YOU, your dealer, and your market. Joe made a good point in another post - he experimented and found that plain listings were better, another poster mentioned special characters in the title - it is all about what works for you.
The beauty of a service like ours - you can spend time experimenting yourself, or you can sell cars. Just make sure you, and/or the service you use, follows the "terms of service" from Craigslist.