It's because of the transmission. The 6 speed is quicker.Finally got out and drove a 2017 today. It felt significantly slower than a 13-15 and Car & Driver backs me up. They had the 15 at 6.5 to 60 and the 16 at 7.2. That's a huge difference and really changes the character of the car, IMO. It felt really sluggish. Between that and the terrible joystick, I'll stick with my search for a 13-15.