Our club did a time trial race to see where we're at, unfortunately only 3 people (including me) showed up. 5 km ITT, I was using a 10+ kg bike with box section wheels (Kysrium Equipe rear) and riding on the drops, definitely not flat back position, kind of a bit loose top (Saeco jersey), no aerobars, course was somewhat rolling and there was traffic on the road, which screwed me up because two cars came just as it was my time to start, so I lost a couple seconds there. Wind was pretty much calm. Anyway, I averaged 39.2 km/hr, my fastest speed was 45.5 km/hr down the hill at the start, my slowest was 35 km/hr just after a hill. Unfortunately I didn't go out hard enough at the end as I wasn't really out of breath (I was feeling lazy, my legs hurt from yesterdays training ride), but was definitely out of breath after the hill and slowed down a bit. The first rider timed themself, and timed the remaining two riders (I went last, and started at the agreed upon time). I think the first rider got like 6.50 for the 5 km (43.9 km/hr) riding on aerobars.
-Bikeguy