On mine I have 5% on the back doors and corner windows and the rear window and 20% on the driver and passanger front. Its dark enough, and at night, good luck trying to back out of a parking space if there is no streetlighting. I even have the brighter ZZP reverse lights and I still cant see them through my rear tint.

Missouri Law states that the front and driver and passanger windows can be more than 35% tinted, while the back rest of the car can be blacked out basically. I like combination for the fact it the 20% against the 5% gives it the appears of a lighter tint without actually being lighter.