I find people tend to overestimate because they think of it as "the speed I see when I look down at my speedo most often..." and most people tend to look at and remember the higher numbers more than the lower ones
Looking at your actual speedometer average can be just as unuseful though..... if you ride anywhere where you have to contend with traffic, lights or stop signs that will drag your average speed down quite quickly. I think thats why our local club defines the rides by the "average speed of steady riding on flat terrain" and not the average for the ride. That hopefully gives people a better idea of what to expect.





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