On my last Eclipse (1996), I had 20% on the back 3 and 35% on the front doors... That worked great for a year or so until I drove through a hick town and some cop in a old beater cop car pulled me over and gave me a ticket for it. The 20/35 combination looked good which is why I'm mentioning it.

On my newer 97, I put on limo all the way around, but that's a chance I'm taking.. Going to try to get a optometrist to give me an excuse also. That's another suggestion if you want dark tint... ask the eye doctor for an excuse.