I do have to issue a bit of a warning about driving someone else's car. There are liability issues that can come up with such a plan.

Are you going to have your own insurance, or are you planning to use the car owner's policy? Are you certain that you will be covered by their insurance. Do you understand that if you do get into an accident, both you and the car's owner can be held financially responsible? What about a breakdown? Are you going to have to pay for the tow and repairs or is the owner going to cover it?

Since it doesn't appear you'll be going through a professional driveaway company for this trip, there are a lot of issues you need to be aware of that go far beyond getting the keys and gas money. I would strongly suggest you make sure all of your bases are covered before you get on the road.