What I'm getting at in my post was simply to say that I doubt 4 ounces will make a notable difference. Of course if I ride a 40 lb. bike from A to B, then ride a 22 lbs. bike the same distance I'd likely be notably quicker.
I wasn't trying to be a smart @ss either, but I see people getting, in my opinion, "fixated" on minutiae. Sure, 4 oz. here and 6 oz. there, do add up. I get it. I just believe that the energy one expends worrying/fretting about small weights can be better used improving fitness or whatever.