Originally Posted By: Tegger
It is also possible that airflow over the vehicle is smoother without the trim sticking up. Automakers are squeezing out whatever tiny gas-mileage gain they can possibly find, what with CAFE regulations ramping up severely in the next few years.
With no trim, the car may be a bit more quiet at highway speeds as well.
Regarding rust, the only thing that comes to my mind is that roof edge, right on top of the windshield is now exposed, instead of being covered by a rubber piece. It may accumulate more stone chips. My grand caravan is like this, so I will see with time how it holds up.