Considering removing the windshield wipers...

I didn't read the entire thread. Too long.

But, in response to the original premise:

Assuming 45 mph.
3.14% x 45 = 1.413

The formula for yearly gas expenses is

Normal:
(15,000/45) x $2.299 = $766.33

"Improved":
(15,000/46.413) x $2.299 = $743

Theoretical Yearly savings: $23

For the mud flaps:
"Improved":
15000/46.224x 2.299=746
Savings: $20/year

 

I removed just the arm today and noticed that doing so certainly improves the visibility to the rear, in the outside lane just where it's needed, but until I check the legality here in New Hamster, I'll leave the mechanism, in fact I might even do this:
Well, it will be about as effective as the OEM wiper!