Sounds about right. I bought a couple of (non-Tesla) cars in 2023, the tax rate was about that (almost 11%, slightly higher for gasoline vehicles). WA taxes have been going up as people vote in more and more government spending. Just annual plates are costing me ~$4K a year on 4 cars. We now have a payroll tax (so no deductions allowed), capital gains tax, EV taxes, increased tolls, increased property taxes, and until recently some cities were talking about adding a separate income tax (but that was banned by recently passed legislature).