According to a data from Dataium, the conversion rate of the average unique visitors to shoppers was 59% during the month of December 2012. This information is based on statistics for national automotive Internet behavior for December 2012. 

Below are a few key statistics from Dataium’s data for December 2012

Average Unique Visitors to per Websites: 4,199

Avg Unique Visitors to Shoppers (conversion): 59%

Page views per shopper: 10

VINs viewed per active visitor: .12

Average shoppers to lead:

LTAV (lead to active visitor): 3.86%
LTV (lead to visitor): 2.26%

Search Percentages:

New: 46%
Used: 54%

Click here for more information from Dataium.