I'm with the others. When I was younger I thought the heavy tint was cool, but night vision sucked, especially having to back up with the door open to avoid curbs and low objects. Plus, I got stopped by cops just because. They thought it looked dark and wanted to meter the window. Of course I didn't go over legal on the moving windows so they didn't get anything but yeah, I stopped doing that.
My current car - '16 - is Maryland legal max, I think the tech said 35%. But he told me to keep in mind, some OEM / factory car windows come with light tint from the factory and if you use max legal tint (for your state) on top of the car's light window factory tint, it may go over when metered by the cops. So again, it comes down to how much of a **** the cops wants to be when you get pulled over anyway.