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It would fail. The refractive index would make it opaque at that angle.
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It's meant to be horizontal
* so you don't look through the material at all when looking straight back, only if you were looking backwards sideways in the silly way, would it be in the way.
*) Nearly, you could make it the same angle as from you eyeballs to wherever on the rear window it starts.
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)