I believe the faces.dat file is the file of building/parks/river images. You could delete that file and keep all the road mapping, and probably get both maps to still fit.
Also, crpoi.dat stores additional POI information like street addresses, the stuff on the "details" tab. In map 865 and later, Tomtom replaced street addresses with websites (how useless - what a dumb move...). You can delete crpoi.dat, and still keep your POI's coordinates and phone numbers. That also can save some space.
Before doing any of the above, make a backup of your map first.
mvl
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Americans, do you want to have to throw away all your existing GPS devices, and be forced to buy newer more expensive ones? If not, contact Congress and the FCC, see below.
http://www.saveourgps.org/
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