Yes, you may be able to claim sales tax and registration fees on both cars:
To
claim sales tax paid on a new car, you take it as a deduction on Schedule
A. Go to Deductions & Credits>Estimates and Other Taxes
Paid>Sales Tax.
To deduct the
registration fee, you take it as a deduction on Schedule A. Go to Deductions
& Credits>Cars and Other Things you Own>Car Registration Fees.
Depending on the state in which you live, you may or may not be able to deduct
it