This is pretty much backwards. Energy use per distance goes up as the square of the speed. Acceleration uses energy too, but deceleration recaptures most of it.
The tricks to really increase range are to keep speed moderate, follow a safe but close distance behind a large vehicle, and speed up and slow down gently.
Indeed, the resistance losses in an electric motor increase as the square of the current, torque increases linearly with current, so running higher current to produce more acceleration or deceleration is less efficient.
But, I^2 resistance is not a large effect compared to the losses from air resistance at high speeds. That is, slowing down from 75 to 65 will have more effect on range than how quickly you accelerate to 75.
