I'm having to run in sport mode all the time, because the transmission is up shifting when it shouldn't, and not downshifting when it should. It will shift up to 7th gear doing 45 MPH. When I let off the accelerator pedal, it will stay in 6th gear down to 20 MPH. Default mode should operated the same as sport mode, but at a lower RPM threshold. That's how my 2016 Challenger A8 operated. When letting off the gas, the transmission should downshift commensurate with speed/RPM.