Noise - no, its a garage. Not a problem as long as there's good acoustic insulation between the garage and living space.
Condensation on the cold floor surface? - not a problem if well ventilated which you'd want with gasoline in there anyway. You'd want good air sealing between the garage and living space.
I think I'd worry more about traction, especially if the floor was wet, and wonder if diamond plate is good for that. An epoxy garage floor coating might work well.