Is it okay to walk away from a car deal?

Yes. Until you sign a contract, you can walk away for any reason, and doing so is often your strongest negotiating tool. If the numbers don't match what you agreed to, you're being rushed, or something feels off, it's fine to leave and come back later or shop elsewhere. Ask for the final offer in writing before you go so you can compare it. Don't feel obligated because of time already spent.