i've had my windows break on me when i got t-boned. that wasn't fun. thats why i always drive with the windows down. the glass breaks into supposedly safe pieces, but theyre not safe when theyre flying into you.
gas mileage difference is negligible. so is speed. i bet it would be a difference of 1/100 of a second and 0.01 mpg. if you're so worried about aerodynamics then you should shave your doorhandles, remove your emblems, take off your wipers, etc.
and while you may be looking forward when you race, the cops come off the side streets, and your mirrors are on the side too.
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