And how often have you seen anything advertised for the G8? Without advertisement it's going to take some time to get enough traction from word of mouth and just seeing them on the road.
P.S... merge
http://www.camaro5.com/forums/showthread.php?t=19930
And here's the sales of the G8...
March (of 2008) 777
April 2126
May 1831
June 1536
July 1472
August 1915
September 1651
October 1082
November 1133
December 1479
January (of 2009) 1331
February 2705
March 2939