O.K. Stop. Just stop. You have an observation and you've jumped from that data (which may or may not be statistically significant) to a cause and effect conclusion. Did you check the tire inflation on these rides, the wind, the barometric pressure? Was the power equal or did you produce more power for the faster rides. If so, was that due to the bike or external factors? How do you know? The questions just keep piling up.

If you want a Cervelo, get it, but don't believe for a minute that you know you'll be faster on it.