Cat and Alvaro make good points, it would be good to know how relevant the speeds Daniel M travels at. If it can't keep with traffic and is too slow, its kind of a useless execise, like the 10000 mpg experiment that don't go over 15 mph and can't carrry anything.
Everything depends on the environment, sometimes you don't even have to keep up with the traffic, because that's almost non-existent On winter mornings I could easily do 50-60km/h (31-37mph) along the road 811 (in Hungary), because at 6am the best unit to measure following distance was km. And I had to go that slow because it was already cold enough on the bike without going faster
Anyway, if I remember well, he always mentioned city riding, and not of the fast kind.
Daniel M posted a few a times after he first joined, I didn't realize he only had one tankfill . Too bad, I guess he's just drop off the list due to inactivity. This is why I have great respect for veteran hypermilers (like Cat, Alvaro, Basjoos, PalePal and other frequent posters ) that list every tankfill in their garage so that you can see their progress, consistency, and info on what happened that tankfill.