none of the above. nascar racing has been proven in market surveys to have little influence on auto buying decisions. it has a lot to do with the cars no having anythng to do with the street vehicles they are supposed to represent.
GM made the best point about this by running ads about their wins in SCCA, ALMS, Rolex Endurance Series, and other production based racing series. it is also the reason that ford and gm have both made financial moves to push their prducts more in production based racing that has traditional been the selling place for porsche and bmw cars.
