Depends upon the colour of the car to some extent, IMHO. In this case the black background really makes the white roof pop, and shows the burnt orange as well. The roof almost disappears with the white background. On the other hand, a black or dark car might suffer with
a black background. Just my opinion.
I really like shots with natural light in a lot of cases as well, and I have also seen some photos taken with a scenic background that look nice.