One thing you will eventually realize about biking, hobkirk, is that it is ridiculously easy to consistently improve your performance and achieve personal best times and average speeds. What you do is to get yourself set, and take several deep cleansing breaths, while visualizing yourself moving effortlessly at great speed. Then start out, clip in, and very very slowly increase your cadence up to your target. Get up to a comfortable cruising speed, hold that for good while, say a couple of miles, and then very carefully, while pretending to get your bottle for a drink, reach down and turn on your computer :-)