hippy-
If you can sit on 30kph on the flat then sitting at 40 in a bunch is easy. (in reply to Beseku)
It should be easy, but you have to be able to 'ride on a wheel'.
This is skill which most people can learn, but a few find difficult or impossible. I think it's to do with the quality of a person's binocular vision which is important in judging distances. My ex, although claiming to be a cyclist, was completely hopeless at this, and I realised later on that she had difficulty judging distances even when crossing a road on foot. Another rider I knew, who was capable of being a contender in TT's at national level could not stay in a chain gang for more than half a mile - he was fine when on the front, but useless elsewhere.
A different point is that wind direction makes a huge difference to a weak rider (often me) in a fast moving bunch. Into the wind it's easy because it's the hard men at the front who are really doing all the work, whereas with a tailwind there is much less difference between your effort and those at the front.
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clubman
Having never ridden in a group, I've never known quite how much benefit it gives you? Would it really up your average speed from 25 to 30-35km an hour over that distance?