I found a website
It says that "Residency is not a factor in determining if tax is due".

What should I do? I bought the car on March 25. I will be moving this Thursday, on May 13. That is only 49 days. Assuming it takes 1 week to get to CA, that means I would have only owned the car for 56 days outside of California. And I would have to pay CA sales tax.

The only solution I can think of would be to store the car here another month. But then I would have to rent a car there for a month.

Any ideas?