Depending on how important the two shot is for you, I would rent a three point suction rig and mount on the hood of the car, which can be seen on the same page Erica sent you to. It's a lot easier to use than it looks.
For inside or outside of the car, you should use a wide angle adapter – even fisheye lenses look good used from the passenger seat.
I've seen too many docs where the filmmaker had a great story but killed it with poor technical skills. I don't know Mike, or you, so maybe my advice was unwarranted, but my first reaction to first timers (including myself) is to learn the camera before you start shooting. Point and shoot is an aesthetic that works for some situations, but not all. It would suck to be in one where that look won't work for you.