As surprising as that sounds, yes it does. The difference is how the differently sized EU packets are handled. You can charge the MFR twice as fast with MV eu.What does the energy you give it matter? As far as i know, whichever you give it MJ or EU it would work at the same speed. But i haven't tried to run my harvesters on MJ yet this map so i cant tell. But does that mean that which type of energy you give it acually matters?