I usually don't bother to try and keep up with or pass people since 99% off the time I'm on the 3-speed, and accelerating a 38lbs bike takes a lot of effort.
But... today I was going downhill when I came upon two girls on road bikes, I wasn't sure if I wanted to pass them or not (because it meant giving up such a wonderful view) but we were going downhill, and there was a tailwind so I had a rare chance to really spin in that seldom used 3rd gear. They let me pass (they moved to the left so I could pass on the right - they must be new to this whole bicycle thing, so I'm probably giving myself too much credit) and I stayed ahead of them until we had to go our seperate ways (about a 1.5 miles down the road or so). They didn't even begin to catch up until we had to start going uphill and into a headwind.

The point is, I beat two girls who weren't even racing, and maybe not even very experienced on my 38lbs. clunker (generator was on at the time by the way) when they were riding much nicer, lighter road bikes (and wearing some spandex too). I could brag that I also passed somebody who was obviously pretty new to biking on my way uphill earlier that day, and another girl on a mountain bike also on the same uphill stretch.

I'm going to say that I was probably putting out a gajillion watts at the time.