You would be limiting yourself compared to what you should be able to enjoy with a changeable lens body.
@Edp uses a 75mm as well as many other lenses for his images:
https://www.fuji-x-forum.com/topic/31761-i’ve-found-the-x-t5-to-be-a-capable-camera-for-motor-sports/#comment-99515
As @OzGordo and @Astigmatism mention, try shooting from different distances and find where the lens gives you the pleasing shot for the perspective you want. There are quite a few car - sports shooters using lenses with considerably longer focal lengths to get great shots, as well as wider angles lenses for certain shots.
This link has some more information about perspective distortion:
https://en.wikipedia.org/wiki/Perspective_distortion