It depends. First, you must itemize to do so. Then, you must choose to deduct state and local sales tax rather than state and local income taxes. If you make this choice, you can add the sales tax on the car to the amount of sales tax that the IRS allows for your household size and income.
A revenue ruling is the Commissioner’s “official interpretation of the interpretation of the law” and generally is binding on revenue agents and other IRS officials. Taxpayers generally may rely on published revenue rulings in determining the tax treatment of their own transactions that arise out of similar facts and circumstances.