I never understood why you bikers did that. I guess if you are a racer maybe it makes sense to you but I never got it. It happens to me all the time since I always ride alone...I'll pass someone who's going slower than me then 10 sec later they are on my wheel and passing me once they get 100' ahead they slow back down to that pace that is slower than mine...
For me it's pass me and stay ahead or don't bother passing me at all. Personally if you are a racer go find other racers and, you know, race. I also have noticed too that road cyclists at least tend to be a rather surly lot. I often say good morning when I pass someone but only get a response back about 20-30% of the time I'd say. I have stopped saying anything to the guys that have the earbuds in though.
I'm sure you'll drop weight. Unfortunately for me I can never judge my leg strength by the gears I can ride it. I can only go as fast/hard as my knees let me. My next bike is going to have lower gears for sure.
BTW any of you guys have an opinion on Mechanical vs Hydraulic disc brakes. I've done the reading and mostly it says hydraulic are better but more expensive (that always seems the way). But it is really that different to justify the 2-3X cost difference (at least that's what it looks like)?