How much does GM spend on advertising per vehicle sold?

Depends on hundreds of factors that can not be known by anyone but top management at General Motors. For example, they spend a much different amount on advertising for each vehicle type. They also change their advertising expenditures dozens of times a year. They also spend money to place advertising in 100's to 1000's of different locations, some just for GM "the company" some for the product lines "Pontiac" or "Chevy", some for the cars themselves. In short, no one knows the per car advertising expenditure (outside of the top management).