As much as I love racing, my favorite part of the game is taking a car and tuning it to perfection, or the closest I can get to perfection. I run a few races before I file the car away in my garage, and then I start over again with a new car. I'd have a fairly even ratio of cars/wins if it weren't for the fact that I buy anything that looks interesting in the UCD, often to just forget about it without ever even changing the oil. Eventually I'll get around to driving all of my cars....
The only car that I consistently drive is my Amuse S2000 GT1 Turbo, customized for time attack. I've dubbed her the "Hayabusa", in honor of the Nakajima Ki-43. I have yet to find a car that is more enjoyable to drive, though when I do I will probably retire the old girl like everything else.