When the Model S is going downhill and using regenerative braking, if you apply the brake pedal the amount of regen (as shown on the IP dial) is reduced, even though you are slowing down more. In the same situation in my Fisker Karma, when I apply the brake pedal the amount of regen increases. In fact, the first -.25g of deceleration is done through regen, and then it seamlessly adds friction braking if you decelerate harder. Is there some reason the Model S doesn't do this?