If you have dartcraft installed, Force engines can be used to multiply the energy given by a bucket of lava. If you add water, it does the same 20000MJ as the magmatic. If you add Milk, it does x1.25 the amoumt, equaling 25000MJ. If you have some bees going, you can use Icy Bees to get Ice Shards which you mix with snowballs in a squeezer to get Crushed Ice, which doubles the efficiency to 40000MJ.