I keep a log of all my bicycle rides for grins and for reference. Each log represents a year's worth of bicycle rides. The logs are kept in Micro$oft Excel and webpages generated through Excel. The comments usually indicate what route I took and note anything interesting that might have happened along the way.

The Excel spreadsheet calculates the average speed based upon the distance traveled and the elapsed time of the ride. I have found this result to be more accurate than trusting the average speed calculated by a bicycle computer. I have found that many Bicycle computers have a tendency to round on their average speed calculations which can result in errors greater than 1/10 of a mile per hour.