Don:Better reconsider my post#18:it not only spells copper saving, but also does not increase energy consumption i.e it is 'Green'. Your posts show NEC encourages increased energy consumption; not good. Let NEC be made "Green" too.
The main reason to parallel conductors is to save copper.
The amount of copper in the parallel runs is always less than the amount of copper in a single conductor with the same ampacity.
The resistance of the parallel runs will always be higher as will its voltage drop, unless the designer calls for larger paralleled conductors than required by the rules in the NEC.