apologies - I was given these numbers while training as a political party's election agent - I didn't know they were that stale!
Thinking about it, they may be talking about readership rather than sales. People can pass around a paper in the break room or family members may read the same paper. I'm not sure how well they can estimate those numbers though.
Sales figures obviously give a much more concrete number for comparing paper to paper, but if you're trying to make a comparison to TV viewers or some other type of media maybe the readership numbers are more meaningful.
The Mail hasn't had daily sales over 4 million this millennium. But since you apparently overestimate the guardians sales by 100% too I guess the point you're making still stands.
http://en.wikipedia.org/wiki/List_of_newspapers_in_the_Unite...