We all know that in EV mode the Prius can drive about 2km. But this implies moving the car from a dead stop to it's max speed of 50km/h, or to a lower cruising speed. When already at speed though, I have the impression that I can drive much more than 2km with the engine off, with a 3/4 charged battery, since to keep the car moving at a certain speed (e.g. 50km/h up to 70km/h), requires less effort from the electric motor. Did anybody manage on a flat road to see how much they could sail (which is not gliding - gliding implies that you let the car roll with enough gas applied to avoid re-gen braking) at several different speeds? I unforunately live in an area where long enough stretches of flat roads are very hard to come by.