In Texas, you can return the car within a timely period. It does vary depending upon problems with the vehicle, but not just because you want to. Texas hold a "lemon law" prohibiting sales of vehicles that do not meet state inspection standards.
The great state of Texas has a 3-day "cooling off" period for ANY purchase contract, for ANY reason. You most certainly can return the car and cancel the whole dang deal, if you want to. Most states offer some type of consumer protection, similar to this. Check with your state's Attorney General's office and look for the consumer protection links.
I'm afraid Cindy is wrong: here is the law relating to the "cooling off" period.
The BBB notes that, under both Texas and federal law, there is a "3-day cooling off period" that applies to certain contracts, but not to all contracts. Some important points:
Generally, the 3-day cooling off period applies to contracts signed in the customer's home - not at a company's place of business - for consumer goods worth $25 or more. If this cancellation period applies, it should be stated in the contract. To cancel a contract under this provision, mail a written notice of cancellation by midnight of the third business day after the sale. The written notice does not have to be received by the seller within three business days, but must be postmarked within that time. While a customer may choose to call or fax the seller to notify them of the cancellation, the phone call or fax does not cancel the contract - only the written notice does. The customer does not have to give the company a reason for the cancellation. The seller must refund any deposit or down payment within the time stated by law. While neither the Texas Attorney General's office nor the Federal Trade Commission can provide individual legal advice, both offices offer consumer publications with tips on contracts. Contact the Office of the Attorney General for its publication "Door to Door Sales" at www.oag.state.tx.us, or call 1-800-252-8011. Contact the Federal Trade Commission for Facts for Consumers on the "Cooling Off Rule" at www.ftc.gov.