I have 20% over the factory 20% on the rear windows making it about 5%, and 20% on the front windows. It's plenty dark at night, I see people going up to the truck trying to figure out if I'm in there and I walk up behind 'em lol! Tinted front windows are illegal in MI so even though I'm in Indiana, I am up there alot and haven't had a problem *knock on wood* They are much more concerned about the windshield tint. I don't have that tinted. I still have to roll down my front windows to see out the mirrors good enough to precision park. I'm considering putting another 20% over that so they're all even but I dunno if that will be too dark for my liking at night.