I'm no expert but Tommy's mileage appears to have been verified in the best way that the technology of the time would have allowed. UMCA and their HAMR Rules didn't exist in 1939 / 1940, so obviously Tommy wasn't working to those Rules. However, verifiability wasn't one of the reasons for my comment that the rides are not really comparable. I was thinking more of the bikes being used, the road conditions and the information technology that's providing input on things like forecast wind speed and direction. Use of tri-bars, carbon bikes, recumbents and even modern lights make long distance riding materially easier (but not easy!) now than would have been possible with the technology of 1939/40. Tri-bars alone would be worth 1-2 miles an hour at the speeds that Kurt has been averaging. However, riding 200+ miles a day for 365 consecutive days is a serious challenge on any bike, even with today's relative advantages. It looks like Kurt will be the first to establish a record under the UMCA's HAMR Rules, as he is already ahead of Steve Abraham's total, so Kurt's mileage will be a natural target for anyone else riding under those Rules.