Yeah, as long as things are properly balanced, I'm fine with it. Not only if things like mass and what not are ok, but the fact there are 3 steps to make fuel seems like it's balanced. Number 1, use a drill to mine ore. Number 2, store it in an ore container. Number 3, convert said ore into fuel of choice in the ore converter, using a huge amount of power with slow processing. Yeah, I'd say it's pretty balanced.