We've surely all heard the saying "Win on Sunday, Sell on Monday" with regard to automakers (and gasoline/lubricant companies as well), but I suspect that it only works for a while, and then goes stale.
As a fairly avid reader of say, newspapers, I can't remember the last time I've seen any serious coverage of drag racing in any major newspaper (even the Indianapolis Star doesn't give all that much really serious coverage to motorsports, and Indianapolis hosts three major racing events every year!).
Sure, drag racing gets lots of publicity in magazines, even has its own couple of mags covering the sport from blowers to slicks, but those aren't really "general interest" publications--not every bookstore or newsstand carries them. Even TV coverage of racing is pretty much limited to cable channels, and then not even the really high-ratings channels. So, does "winning on Sunday really translate to selling on Monday" anymore? With companies such as Castrol--does the large sums of money spent on race car sponsorship inspire increased sales of their motor oil? Sure, it more than likely did, back in the 1960's when Castrol was the principal maker of racing motor oils (their name comes from Castor Oil, which was the preferred engine oil with racers of just about all forms of motorsport for the first 60 years or so of auto racing). But I suspect that Castrol has taken a long look at the dollars they were spending on sponsorship, and decided to take a different tack on advertising--that's happened innumerable times down through the decades of auto racing.
Same with Ford: Does spending a lot of sponsorship on a Funny Car team REALLY translate into selling Mustangs--especially considering that the only thing about that type of race car that truly resembles a Mustang is the legendary FORD script logo? Ford Motor Company has sponsored race cars many times in their 110-year history--with the intent to "win on Sunday, sell on Monday", and if that tactic doesn't sell more cars as time goes on, why continue it (from a business perspective, anyway)?