miiipilot brings up a good point. They charged you the rate for their state and you are now responsible for the difference when you register the vehicle at the time of registration in your state.
side note: I paid 6% sales tax on my car and pay property tax every year. It's not so unheard of.
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2014 CC R-Line DSG | 2010 S4 Sold | 2010 BMW 135i Retired | 2006 Lotus Exige Sold