I pass most of the other cyclists on my commute but I don't feel like I'm racing, I set my pace and stick to it. However, there is a guy who rides my regular route on a c-dale mtb with slicks. He is seriously fast and he inspires me to ride just a little bit quicker. The first time we 'raced' I was on my mtb with slicks, I dialed it up to my max but it must only be 399 watts cause he just kept pulling away.
The other day, I saw him while I was on my road bike and it was about even