Sales tax goes by where you register the car unless you are registering out of state, then it depends on the reciprocal arrangement if any, between the two states.
For example, if you buy in CA and drive out of state, you pay sales tax based on the dealer zip code but if you ship it out via truck then you pay sales tax where you register the car.
For example, if you buy in CA and drive out of state, you pay sales tax based on the dealer zip code but if you ship it out via truck then you pay sales tax where you register the car.