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You could also try the V-Spoilers / Airtab style Vortex generators on the front 3rd of your hood..
With the big rigs, a few studies have shown an increase in fuel economy ..they do deflect bugs, and dirt from what I have seen..Doubtful on a big stone being deflected by an air curtain, but might change its trajectory somewhat..
Saying that, a 3" tall piece of plastic at the front of the hood will probably not stop a big stone regardless..parabolic arc of the stones trajectory would most likely bypass it as well..
In Australia the old skool way was a big metal screen in front of the windscreen, to protect from locusts / stones etc smashing the pre-laminated days of windscreens...doubt it would be good for fuel economy however lol
Other way...consider a laminate screen..kind of like a pull off on a motorbike helmet visor..use a clear or similar window tint on the outside..
And only other way I can think of...
There is a ceramic product out there that is put on your cars paint..that also is applied (Sprayed) across windows...results in an ultra hard surface that can be refinished..not cheap, but may help on the windscreen..
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