Originally Posted by downtube42

Speed being distance over time, miles per year meets the definition. Typically people mean distance covered over moving time, and strava and most cyclocomputers will give you that number. Other people mean the instantaneous speed they see most often, others mean the speed over a short period of high effort. Many people count speed while drafting into their calculation. I can take amtrak north or south 100 miles and ride a tailwind home, with average speed reflecting that benefit. I can ride a 70 ft/ mile century with nothing over 4% or a 45 ft/ mile century with 8% rollers. Average speeds will be different.

I'm around 5,000/year.