Here's a plot I made. I don't always track everything (indeed there're some glaring gaps in the data, although spring househunting took a big bite out of cycling). It's a plot of my average ride speeds on rides typically of length 5-20 miles, combined with a log fit to show the trend. why log? well, it's gotta flatten out at some point As you can see, the trend is increasing and I can now rate myself as having moved from glacially slow to awfully slow. That last data point is 16.2 mph over 19.8 miles with 1000' of climbing yesterday, a ride which including chasing down 2 roadies...not that they knew I was behind them, but they did provide a nice incentive, and that's what it's all about, right? In the process I've also become 15 lbs lighter. Another 36 lbs to go and I'll reward myself with a newer, lighter, faster bike in the spring of 2010.