Abstract: The Independently Moving Rod 12 and Holder 30 for Lobe 24 (Apex) of Crank 20, will allow production of extremely fuel efficient reciprocating piston 42 and cylinder 41 engines, regardless of fuel type, without the need for many years of research and development or, R & D. The efficiency is increased because rod 12 moves independently to crank 20, which controls piston 42's movement and speed during most of the power stroke, and by using greater leverage per any certain amount of stroke. The Apex Engine can also be manufactured to be rebuilt by having a few parts replaced. The Apex Engine is simple, soundly engineered, need not be expensive, and will operate.