You have to add in the delivery and registration fees, add in state sales tax and city/town excise tax, but then subtract the Federal and possibly state-level tax credits. So depending on the state your final price could be higher or even lower than the sticker.

From these prices you need to add state registration fees ($100-$500), destination & doc fee ($1,200), and sales tax (0-10% depending on the state and city).

I don’t know about cars but most US prices are quoted before tax. Even for gum at the store counter.

Tax levels vary by state, and sometimes by country or city as well. (Texas levies a 6.5% sales tax on all cars statewide, the local taxes don't apply to car purchases.) There's no way to quote a "U.S. price" that includes taxes.