Let's imagine that resistance forces(aerodrag, rolling resistance, internal friction, etc.) doesn't exist.
Will a car consume the same amount of fuel when accelerating from $0-100km/h$ and when accelerating from $100-200km/h$?
Formula for kinetic energy is $E=(1/2) mv^2$, so with speed rise kinetic energy. Does that mean that the car uses more fuel (higher power) when travelling at constant $200km/h$ than when travelling at constant $100km/h$?
(hmm.. if no resistance forces, car cannot travel at constant speed, he will accelerate towards speed of light..hmm)