How do I power an XBOX One in my car?

Install your XBOX ONE into your car. Geez Microsoft thinks of everything. LOL.

With one of these...

www.walmart.com/.../10746778

I have no issues with the game's physics. I like how the RWD and 4WD cars feel and drive differently. It's fun to feel the rear kick out a little and have to wrestle with the steering to keep some of the more powerful RWD cars under control when cornering.
The physics are very comparable to Gran Turismo. You really do get a sense of when you are reaching the car's limits and the tactile feedback in the controller is very good.

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My only concern is with the overly aggressive AI. It's not all the time mind you and I do appreciate a close race. This has made me pay more attention to how I choose to tune my car within the performance level.

well the car you parked will stay where you parked it, you just cant drive it. I don't know how many cars you can do it with, I only know you can do it with 2 cars. have one car there for show, and another car there to drive

You can use your regular power brick with an adapter that will let your Xbox run off of the cars power socket. I do not recommend using the Xbox in a car unless you are not using any discs... the smallest bump will cause your Xbox to scratch your disc up.