Speaking of that head-forward posture fault...

Got a car that shoves your head uncomfortably forward? Yeah, mine came that way, too.

I've discovered that, at least with my cars (Toyotas), the headrests can be pulled out of the seats, turned 180 degrees, reinserted - and then they don't shove forward like that. I've also found that the two front seats are often mirror images, so if I swap them left-to-right, the height adjustment works, even rotated around so the head-shove portion faces the rear.

Disclaimer: this works for me, and I prefer to sit as upright in a car as I can. If you like to drive leaned waaaay back this probably won't work for you.

If you have a big gap between the back of your head and the headrest you give up some whiplash protection if you're rear-ended (as it is, I can't quite fit my hand between the back of my head and headrest).

And maybe I have a fat head. :-)