No it doesn't.Depends on state for the return window. In California, all contracts have a 3 day "cool off window" where you can get out of it.
"California law does not provide for a “cooling-off” or other cancellation period for vehicle lease or purchase contracts. Therefore, you cannot later cancel such a contract simply because you change your mind, decide the vehicle costs too much, or wish you had acquired a different vehicle. After you sign a motor vehicle purchase or lease contract, it may only be canceled with the agreement of the seller or lessor or for legal cause, such as fraud.
However, California law does require a seller to offer a 2-day contract cancellation option on used vehicles with a purchase price of less than $40,000, subject to certain statutory conditions."