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It's true that the car has rolling resistance to deal with - and "downforce" is really just negative lift. If you cut a Formula 1 or Indy car down the centerline and look at the shape of the cross-section, you will see a shape with a lot of similarities to an inverted airfoil. The total drag on a airplane at a low cruise speed can be lower than a car - but cruising in a car is also fairly easy - all the HP in cars is to get the car going and to keep it accelerating at the top-end. Cruising along at 60 MPH doesn't require a great deal of HP in either a car or an airplane.
On the other hand, the speed and properties of the air are MUCH more simple for a car than for an airplane. In a car (excluding the Thrust SSC and similar land jets/rockets), you don't need to deal with large variations in ambient pressure or air density - and you don't have to deal with transonic effects of flying at Mach 0.80+ like your average Boeing 737.
And then we could talk about stability & control and the difficulty of just keeping the plane flying straight & level.
On the other hand, the speed and properties of the air are MUCH more simple for a car than for an airplane. In a car (excluding the Thrust SSC and similar land jets/rockets), you don't need to deal with large variations in ambient pressure or air density - and you don't have to deal with transonic effects of flying at Mach 0.80+ like your average Boeing 737.
And then we could talk about stability & control and the difficulty of just keeping the plane flying straight & level.