[JRMichler]

If you accelerate a land vehicle at constant acceleration, it will take the same time to accelerate from 0 to 10 as from 10 to 20. But the acceleration from 10 to 20 will take three times the distance as the acceleration from 0 to 10. Same force times triple the distance equals three times the energy.

A wheel driven land vehicle generates force by pushing against a (relatively) infinite mass, the Earth. A rocket is different. It generates force by throwing mass in the opposite direction at high velocity. A properly geared wheel driven land vehicle can generate large force at near zero speed using very little power. A rocket uses huge power to generate force at low speed, so has extremely low efficiency.