Discussed before and I certainly used it. I think it was discussed on the Fuel Frost thread. I think the resolution was that since Boeing had not issued a 'no objection' ruling on it it was not flavour of the month. I have not seen it in a company SOP for a while now.
It worked brilliantly and the only two caveats were to ensure that max wing root load was not exceeded (NB ZFW) and to ensure that the now incorrect c of g was taken into account It saved many de-icings or delays before the introduction of acceptable upper surface frost on the modified NGs.
Todders - another company's fuel price table will be of very little use to you since most companies negotiate different 'contracts' at different airfields.