Weird mirror mount humps

What are these humps for? They are on the mirror mounts on my 2019 SR5.

 

Same thing

 

aerodynamics is my guess

 

Ahhh. Vortex generators. On a Tundra!

 

They are suppose to keep the mirrors from whistling at you when going close to the 90 mph range,,, aaaaa that is what was told to me. My 13 TSS would whistle all the time going out 10 West to the lease!!!

 

More hype for sure....
I wouldn't believe that "sales" guy to know much with technology, only because that was my job in the military.
https://en.wikipedia.org/wiki/Helical_antenna

 

Salesmen. Kinda like that ol' urban legend that you can throw your ride in reverse going over 40mph and your truck won't seize and blow up..............................

 

it is for aerodynamics, cheap attempts to reduce drag on the vehicle there by improving fuel economy.
http://www.ijirset.com/upload/2017/tapsa/11_auto_019.PDF

 

The Tacoma has a couple more than we do. Its as everyone else said aero and wind noise

 

So myth busters had that episode where they changed the surface of a vehicle to resemble a golf ball. If I remember correctly it got better gas mileage. So maybe a hail storm is natures way of helping you out.

 

You only see the effects of the fins at super sonic speeds. Just bypass the engine governor.

 

4Runners have them too.

 

I noticed these last week on my truck and was impressed with the fine detail. I was thinking toyota hired a design engineer that previously worked with wind tunnel testing in the aircraft or racing industry. Regardless, Whether functional or not, they are very cool , someone had to convince someone, who had to convince someone... to add to the complexity, and probably the cost, for that tiny design change.