I've only got one bike, a CF roadie and I only have roadie kit. I commute in my roadie gear wearing a backpack with my work clothes. Work has a shower, so getting sweaty isn't a concern. I'm usually the one doing the passing (with an 'on your left' or 'good morning' to each passee), but I was blown away by a guy in full team gear on an S-Works Tarmac a few months back. I was doing about 21mph up a very slight rise and he came around me without so much as a 'Hi'. I figured I'd drop my head and see if I could spin up to match him. Nope.

I was just about 25-26mph and he was still pulling away when I gave up, knowing I still had another small climb before I got to work AND a ride home that has about 1000' of vertical. That guy was MOVING.