Our flight was scheduled to leave for EWR at 1030 from MXP, so we made plenty of time to check in our rental car (Hertz), make it throught security and arrive at the gate with time to kill.
Those plans went slightly astray when we discovered that finding the car rental return parking area was not as easy as it might have seemed to the casual observer.
We made two complete loops of the airport then, at the last second (the rising sun was obscuring the sign for "autonoleggio" - rental return), we headed for the Sheraton Hotel entrance, which was mere meters before the entrance to the rental return.
So, as you are approaching the terminal, stay to the right, looking for the autonoleggio sign and the sign for the entrance to the Sheraton Hotel, the rightmost of the three options, then follow the signs to the dropoff.