> Does this means that for a fixed tile height of 256 pixels, the number of
> degrees is different at 60 deg. latitude thant to 40 deg. latitude ?

Yes.
http://en.wikipedia.org/wiki/Mercator_projection

> Just to be sure, I must ask: then, based on your answer and what I have seen
> in your page, it is not possible to do so ?

What you describe is creating your own projection.
http://econym.org.uk/gmap/customflat.htm

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