[Diesel_Dave]

The changes to the accessories won't change the map at all. The same amount of fuel creates the same amount of power at the flywheel (where BSFC is defined). Because of the reduced accessory loads, however, a greater percentage of the flywheel power will get to the wheels--so to get the same power to the wheel you will be at a slightly lower fueling point on your map but the map itself hasn't changed at all.

Your timing advance will change your BSFC map, because the same amount of fuel will now generate more power. That being said, the shape of the map will probably stay virtually the same--the whole thing will just shift to a slightly lower BSFC.

All that being said, IMO these changes are far too small for you to try to change your driving style.