Bingo.Actually, this is a much better illustration of reika's point. A gasoline engine requires a decent amount of iron, as well as a bit of gold. (Can someone give exact amounts?) This will give 124 rf/t, about equivalent to 1.5 steam dynamos (16.5 - 18 copper, 1.5 silver) while gasoline requires more infrastructure to make fully sustainable (sugar plantation, sugar grinder, fermenter, sand grinder, composter vs tree farm and a powered furnace )