Living in a flatland state, the only resistance I have is a good headwind and we get pretty good headwinds on a daily basis. If my wife rides with me, we average 10 mph. On my 30 mile, daily solo rides, I can maintain 17-19 mph riding on aerobars. Depending on how strong the headwinds are, I've gone as low as 13 mph and had to struggle to get that. During intervals, my sprints have gone up to 24 mph and the fastest I have gone while drafting is 28. That's probably slow for some of you, but I'm 65.
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HCFR Cycling Team
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2017 Colnago C-RS
2012 Colnago Ace
2010 Giant Cypress