Replying to French press coffee

anyone use one?  if you have, answer me this...does it seem like there is noticeably less caffeine?  I've been drinking it for the past month (not by choice I think it sucks balls taste-wise) and I had a cup of drip the other day an hour after my silty cup of french press, and I got a pretty big buzz.  i suspected it had less caffeine for a while.

also, does anyone not feel the caffeine from energy drinks?  I only get a noticeable effect from caffeine from plain coffee.  energy drinks will keep my awake but they won't give me anything I really feel.