I find that even real, natural driving shots often look fake, but I'm not sure why. I've accused a film maker friend twice of using "janky and obvious looking greenscreen" for driving shots and both times I was completely wrong. Once was a car on a trailer which might have accounted for some of the unnatutalness, but the second time was a real quad bike driving on a real road with a chase car in front of it and a backwards facing camera-person.