I think it's good to have the car not roll perfectly straight, but a little bit to one side. If it rolls too straight, it's going to bump from one side to the other and lose much more energy.
The energy you lose from lateral collisions has very small impact on the forward movement
rolling as straight as possible might bump from side to side, but between the left and right side the wheels will be rotating with as little friction as possible.
deliberately going to one side guarantees that the wheels will never reach max speed.
rolling as straight as possible might bump from side to side, but between the left and right side the wheels will be rotating with as little friction as possible.
deliberately going to one side guarantees that the wheels will never reach max speed.