Hmm my garmin 705 said that I was up to 205 last year when I was trying a new way home from work. The temperature was more than I was used to, the hill was steep, and I was very out of shape. Oh ya, I am also over 40... When I push it on my commute it is not uncommon for me to be in the 180-185 range. As the year went on I was still in the 180s when I was pushing it but I would drop much lower and faster when I was waiting at the traffic lights.
Stuart.