Do GC and above players hold powerslide when supersonic?

I'm not sure if they do which is why I'm here.

By holding powerslide and going straight, you can be supersonic for longer without having to use as much boost.

I cant really remember but I don't think the pitch is as big to make this like a game changer but a pro probably needs as much as an advantage as they can get.

While trying this theory, I've noticed that some downsides is you can't really turn efficiently and if you can it's quite difficult to do.

Let me know your thoughts 🤠