my tint guy swore the rears were 20's, so i went ahead and told him to put 20's on the front. I didn't think the rears looked quite as dark as 20's, and as it turned out I was right. The front ones came out darker than the back ones, but he was a douche and said if i wanted it matched then I should have asked for that instead of asking for 20%.
anywho, i was a little picky about it at first, but i dont even notice anymore. the only reason i didnt have him redo it is b/c i like the 20% more in the front, and I am thinking of doubling up on the rears down the line.
the reason i bring this up is b/c i've seen many different people say their factory windows are this % and that %, but if you are doing it yourself and you want it to match, you should have the tint guy match the tint to your rear windows before buying a random %.
I honestly dont know if all liberty's have the same rear tint % or not, and if they did, what % it would be. just thought i'd point it out.