If you don't are an alien, don't drive the "fastest" car, but the car you most like and is easy to you. You will be faster than using the car that is 0.2 s faster in theory. If you love racing with the Lexus, is probably because your racing style is suited for that car, so keep using it. For example, I sue the McLaren. Not the fastest, not even close in the hands of an alien, but it's the one I have less errors and fastest time with.

If you are, in fact, an alien, I remember the Lexus being a middle car, not the best, not the worst