I get the claimed figures on both my car and van so it’s not like hitting them is impossible, but it is highly dependent on how and where you drive. Many people drive with the smoothness and ability to look ahead of a myopic orangutan (e.g. accelerate hard, immediately jump to brakes, back to acceleration, repeat) but even with a bit of care there’s only so much you can do if your driving involves a lot of short trips and stop start traffic.