Well actually there are 2 Umpa Lumpa Troll's wondering the halls of ECF that, if you leave the door open on a thread or sub-forum, they will wonder in, ask some insanely stupid questions then slough away but most ignore them, some play with them for a little while but tire quickly.
But to answer the OP's question based on my personal experience, yes and yes, dual coils take more juice to produce vapor without burning and higher voltage/wattage will use more juice because as you vaporize it faster it has to be replaced in the coil faster to prevent burning and as a result, faster = faster.