Okay, sorry it's taken me this long to pay attantion. So "little Miss Sunshine" it's true, I too hate doing insert car work. On this film they (DP) would always use two camera's. One from the front and one from the side. The one on the side meant that the side door had to be removed. This was painful. So I did what you do, radio mic all the actor. Then I multi-tracked, and prefaded them all, and of course gave them a mix. Most of the car rig was on the I-5 from the 14 to Valencia, which meant that semi trucks were passing or 40mph circus at high speed. What else can I say, oh yeah, the grip department did build a shield from the wind in the front of the bus, which helped with any wind in the car.
Steve Morrow