Reddit mentions of Rycote 33702 Softie Lyre Mount with Pistol Grip Handle for Shotgun Microphones

Normally they have a sound recordist in the passenger or rear seats managing the sound. Whenever you see a shot where it's just a driver in the car, it's a completely different take to the one where they're actually talking.

I'm not certain of their exact mic setup, but I'd imagine the recordist is holding a shotgun microphone on a pistol grip. That way there's a lot of isolation between car and microphone to soak up vibrations from the engine, road, etc.

Something like a Rycote 033702 combined with an ME-66 would be a good pairing. I've used an ME-66 for car interiors in taxi cabs in a very similar way and the results were good.

If you're on a budget though, you could get away with a VideoMic or VideoMic Pro attached to an extension handle.

It would be a very good idea to avoid running into a camera - there are so many different noises that can occur in a car that you need to be monitoring the sound at all times and you'll need to frequently adjust gain depending on how high the revs are, how loud the driver is speaking, what type of road you're on, etc. Grab an XLR recorder like a Tascam DR-40 (if you go for the videomic setup you'll also need a Rode VXLR adapter to attach the microphone).

The other way to mic a car which I'm not so certain they're doing is to hang lavs from the roof, but given that they tend to cover the car interiors with wide angle lenses I would have expected to have seen a microphone or two by now.

Not sure how much you're looking to spend, but this is the one I would recommend. Really good build quality and works like a charm.