Figured I'd test this again since it's been quite a while, so I fired up the beta (wanted the most recent build of the game as 3.3 is about to drop and I doubt this will be changed when it goes live) and equipped a T-10 with seven flechette launchers and various permutations of MRPs. I then proceeded to shoot myself, a lot...
MRPs are depleted in the order they appear in the module pane, from top to bottom, which is determined by rating first (Ds always come before Es) and actual module slot location (ones near the top of the list in outfitting are depleted first). I was originally under the assumption that they were depleted in order of size, but this seems to have been a side effect of larger modules normally being closer to the top in outfitting.
Anyway, this has a few interesting implications, namely that if you want to mix MRPs to prolong a given protection value, don't bother with large E rated ones, just use the biggest D rated ones you can slot, then save the smallest slot you can spare for a small E (or D rated) one. If you have an AFMU, you should only need to repair your large D rated MRP.
Also, on a completely unrelated tangent, heatsinks restore ~20MJ of WEP, irrespective of ammo grade from synthesis.
MRPs are depleted in the order they appear in the module pane, from top to bottom, which is determined by rating first (Ds always come before Es) and actual module slot location (ones near the top of the list in outfitting are depleted first). I was originally under the assumption that they were depleted in order of size, but this seems to have been a side effect of larger modules normally being closer to the top in outfitting.
Anyway, this has a few interesting implications, namely that if you want to mix MRPs to prolong a given protection value, don't bother with large E rated ones, just use the biggest D rated ones you can slot, then save the smallest slot you can spare for a small E (or D rated) one. If you have an AFMU, you should only need to repair your large D rated MRP.
Also, on a completely unrelated tangent, heatsinks restore ~20MJ of WEP, irrespective of ammo grade from synthesis.