It might be doable in some cases as I think some states won't charge sales tax for a vehicle if you can prove that you paid sales tax to another state. And the California tax might not be much higher than the state tax they would have paid locally. I'm guessing if the California tax was lower than local tax then they would have to pay the difference to their state. I think I remember one person saying they did pay some more in taxes but the discount they got more than compensated for it. The important thing is for people to check it out prior to purchase what their state's policy is. I also heard about someone who was thinking about taking delivery of a Prius Prime in Las Vegas and then driving it home from there. I never heard if they did or not but that's certainly being creative.