I don't have any financial advice, and based on your situation, no advice that would be relevant to you. But I do have general advice for all road trips. If you have someone in the car who needs to piss, PLEASE be sympathetic of that. Pull over and let them piss somewhere, even if you just stopped somewhere. Waiting over an hour in the car to piss because your friends refuse to stop and you have an overactive bladder isn't very fun.