Today an old guy and his young girlfriend or daughter exploded pass me on the bike path. They were dressed casually and on a tandem bike. So what do I do? I pop my D7 in the highest gear and pump as hard as I can to see if I can catch up to them. As hard as I was pedaling, that couple was still pulling away from me at a pretty fast rate and they weren't even pedaling hard, after about 30 seconds I give up because they are already over 150 yards in front of me. It seems like the only people who don't pass me are kids on cruisers and seniors and I am in pretty good shape too.
Folding bikes are great bus as slow as hell.