Just got home from another great commute, and the legs felt good. I encountered a
wannascalp* - he caught up to me, called out 'passing right', then tried to overtake me, and was surprised when I continued doing the same speed, because he struggled a bit to overtake. He then failed to extend his lead over me, even up a lengthy hill where I had no problems keeping up to him (there was no drafting advantage, either, because we both had a slight tailwind and weren't going fast enough for drafting to make any difference).
I can't help taking a bit of pleasure in destroying cyclists' misconceptions, particularly when I was riding my sturdy (but not light) touring bike, and he had a carbon fibre road bike

.
*
cyclist who tries to overtake you, struggles to complete the overtake, then hasn't got the legs to stay ahead. OK, I invented that term 
.