Bottom line: If you want to go fast, stick with ROP. If you want fuel economy, aren’t concerned with going as fast as you could, want cooler CHTs and EGTs, have the proper engine analyzer and a fuel-injected engine, and are willing to take the time to learn the proper procedure, by all means, give LOP a try. I fly LOP in my turbocharged Cirrus, which has GAMI-calibrated fuel-injection nozzles and a lean-assist blue target line that matches fuel flow with the proper LOP setting. I’ve also taken the time to learn how to adjust for LOP without the handy blue line. When I fly airplanes with carbureted engines or only a single-cylinder CHT or EGT probe, I fly ROP, period.