NASCAR Racing: money spent on advertisement on nascar, dale earnhardt jr, sponsorship deal

Question
I was wondering who spends the most on sponsorship and advertisement in Nascar.

                 Thanks

Answer
It's hard to say who spends the most on sponsorship and advertising. I tried doing all kinds of searches but did not find anything. One thing I came across though was that Dale Earnhardt Jr's 2008 AMP / National Guard sponsorship deal was believed to be worth about $25 million. That's all I know unfortunately, sorry I couldn't answer your question.