I used that G2 and had wayy too much. I looked in and saw half a can and was like wtf, but once you do all your calipers you still have a quarter left. I took lots of pics and posted them... I think. It wasnt hard, I recommend 4 jackstands and paper towels. Like everyone says, use the whole can of cleaner. Mine came out awesome.
http://umkc.facebook.com/album.php?aid=2023231&l=d7032&id=66804639
http://umkc.facebook.com/album.php?aid=2012570&l=23543&id=66804639
I wonder if those links will work, but its an evolution of my car, lol.
P.S. Heres my old Z3 album if anyone wants to look.
http://umkc.facebook.com/album.php?aid=2004484&l=4a099&id=66804639