Question about gearing for Top Speed

Aero resistances is the enemy. But it's not the only aero enemy. Your first enemy will be lift. Because the top of the car has more surface area the underneath? This causes natural lift. (And the car wanting to fly is typically bad. Lol) Usually just starting at 140 MPH. This is typically controlled with front spoilers to limit/disturb air flow underneath the car. But like everything? That only gets you so far. When pushing towards 200 MPH? You most certainly will be adding rear wing to generate down force. But even if you found the correct formula for a given package? Over all wind drag will eventually stop even the most powerful engines. No matter how gradual you gear to get to final high gear drive. So the question becomes. What is the drag coefficient of a particular vehicle? And as we can all imagine? A whole lot of variables. It's why wind tunnel data becomes far more prevalent with the high speed guys.