Mazda OEM Monroof Wind Deflector

Was curious if anyone installed this on the 2017+ ?

Does it reduce MPG?

I wonder if it helps to reduce rocks from hitting the moonroof?

Does it help decrease or does it actually increase wind noise?

There's nothing magical about the 17 and it's deflector. It's the same answers for any car.
It will help offset the loss of mpg with the sunroof open. Otherwise it will have little impact. However you need to be dong speeds this car is incapable of hitting for this number to be anything you are going to really notice at the pump.
About the only thing they do is cut down the noise and reduce some of the air coming into the cabin.
Where do you live that rocks hitting your roof are common? I gotta believe that is an extremely rare occurrence.

7eregrine said:

Where do you live that rocks hitting your roof are common? I gotta believe that is an extremely rare occurrence.

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Meteorites? That being said, I think the the deflector is more cosmetic than functional. I have used hood deflectors for years and found they do help with bugs and other things that can damage the front of the hood.