As for a window, right in the middle of the back looks like a good spot for a small one.
Mine is holding up good. One guy rear ended me but his hood crumpled, I had to do some touch up fiberglass but no big deal. My seal on the top leaks a bit of water during heavy rains but that is not a beg deal. it puddles then evaporated.
My best idea is about 5-7 MPG gain. I know my coating distance has gone way up. I regular coast .75 to .9 of a mile to a stop. with a tail wind I go a mile.
I get lots of comments on it and lots of looks but I like it.
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