There are 2 routes i take to the city.  If i want to park at Port Authority Bus Terminal (PABT) in midtown, I take the NJTP eastern spur to exit 16E, then 495 to the tunnel.  When approaching the tunnel, it is best to be in the middle tube, right lane.  That puts you in the best spot when you get out of the tunnel.  Once in Manhattan, you need to merge right pretty fast to turn east on 40th street and get in to the parking deck, but if you are too far right you can get stuck on dyer ave south, which is no good.