Pretty much normal for plastic/vinyl parts to be fitted this way. It allows for expansion and contraction, which is more for vinyl than glass or metals. My Volt has the same gap. I find much worse fitting parts in my work and some a lot better. Time will tell if this application of vinyl parts will fit the same after shrinking in the sun. I would guess that it won't.
My 65 Dart windshield vinyl/plastic molding has a similar gap that they "cover up" by snapping a clipping about 1.5 inches long over so that the vinyl and plastic can expand. Seems like that easy method could be used to slow the entry of water and potential for freezing of that water in the winter??
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