Originally posted by: JoeKing
100%
I just stick my head out the window
100% means your windows aren't tinted
.
Just had my windows tinted a month ago, and got 20% on all side windows, 13% on the back. I'm used to it, and I can see fine while driving at night.
EDIT: Forgot to add that I wouldn't go any lower than 20% on the sides. You are able to pick your nose in all but the brightest, direct sunlight, plus visibility is still decent enough to drive safely IMO. Only go darker on the back if you have decent sized side-view mirrors to use at night. Some people prefer to go the same percentage all around, but I've always been a fan of the back window being darker.