Here's why:

* Speed is determined by power and weight: A car's speed is primarily determined by the engine's power output and the car's overall weight. A more powerful engine can accelerate faster and reach higher speeds. A lighter car will also accelerate faster and reach higher speeds for the same power output.

* Height affects aerodynamics: A taller car will have a higher center of gravity, which can affect its stability, especially at high speeds. It will also have a higher drag coefficient, meaning it will experience more air resistance.

* Height can affect handling: A taller car might have a slightly slower response to steering inputs due to its higher center of gravity.

However, the effect of height on speed is indirect:

* Air resistance: A taller car will encounter more air resistance, which can slightly reduce top speed. This effect is more significant at higher speeds.

* Fuel efficiency: A taller car will have slightly worse fuel efficiency due to increased air resistance.

In summary: While height can impact factors like aerodynamics and fuel efficiency, it doesn't directly influence the maximum speed a car can reach. The primary factors determining a car's speed are its engine power and overall weight.