I like this little tidbit from one of the older blog post
I assume this was already in other GT games.
https://blog.us.playstation.com/2017/09/14/gran-turismo-sport-eight-things-you-need-to-know/Thats not the only way you can customize your ride, though. In GT Sport, every mile driven means extra rewards for you; with Mileage Exchange, you can trade in-game miles for a host of customization options for your driver avatar and vehicles within your Garage.
I assume this was already in other GT games.