Hate to burst your bubble dude but you're trying to find a simple answer to a complex problem. Sales do seem to be down right now but its not necessarily for the reasons you suspect.
Contrary to the propoganda (READ: LIES) fed to us by our Federal Government our economy is in a world of hurt. Parts of the SouthEast US are in shambles thanks to Katrina and Wilma. Unemployment is high throughout much of the nation. Consumer debt is sky-rocketing. The nation is divided over the situation in Iraq. Fuel costs are high due to supply, demand, and GREED. crapola
Add to this the fact that the US National debt now exceeds 8 TRILLION dollars (1 Trillion dollars were added to the debt in the last two years alone). We have a trade deficit somewhere in the neighborhood of 58 BILLION dollars. The world has changed around us. We're now part of a world economy (which is whats helped us avoid finding ourselves in a much more significant economic downturn).
Needless to say financial pressures on our economy are quite high. And as if this weren't enough the "geniuses" in Detroit are now trying to recover from their earlier boondoggle of offering cars at "Employee Pricing". The fallout of which is still being felt (try selling a used car nowadays!).
So yea if you were to compare raw numbers its valid to observe that November numbers are lower. Unfortunately its not really a very valid comparison since our economy is tanked.
What we need is for our "elected" representatives in DC to open their eyes, pull their hands out of big businesses pockets, and realize that we have a problem needing to be addressed. We need reforms at the core of our government to allow us to pay down our debt (before the other nations decide we're no longer a good investment), reduce our trade deficit, reduce our personal debt while increasing savings, and help us to claw our way out of this quagmire before we sink into "Third World Nation" status.
In a better economy car sales WILL improve!!
Will it save GM and/or Ford? Only time will tell...