It looked to me like they were driving with the speed of traffic for the most part (what ever that was) with an occasional burst of throttle for the glory shot. They were coming up on a light so probably weren't speeding up too much. One thing is for sure they weren't speeding up after he put it in park as the motor was no longer coupled to the drivetrain. If you heard the motor speed up after he put it in park it's because a fixed throttle position with less or no load equals increased Rpm. Motor is still making same torque at a fixed throttle position only this time the load is decreased so the rpm will increase. The speed of the car will decrease as long as the road stays flat . The rate the speed decreases is dependant on how efficiently the car will coast. Looked like it didn't slow down much.
