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Emissive Map Optimization and Effiency dilemma

polycounter lvl 16
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EvilPixills polycounter lvl 16
Hey guys, I have an issue that has been nagging me.

I am going through my materials and textures in a package I am working with and I am trying to consolidate as much stuff as I can.

Regarding Emissive maps, what would be more efficient; embedding the map itself within the diffuse/normal's alpha channel (which I read can be expensive if abused; but results with less texture usage), or just keeping the map separate which will allow you to have a lower resolution? I am torn between the two and would like to know from the experts which method would be more optimal. Thanks!

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