I'm talking about being able to see traffic behind you through your rear window.

The headrests create blind spots.

I guess you would get used to the lower visibility.

But nothing is absolute.
You get a higher degree of visibility with them removed.

Need fewer troops to support.
Drive a hybrid.
Best tank 71.65 MPG.

Before this car I spent two years learning hypermiling on my 2004 HCH1.