To counter that no POH has LOP operation described & approved in it, a 1980 PA31-325 I operate has LOP ops in its POH, just like 43" described - and that's with the factory single point EGT & CHT gauges. Mind you, I had the owner install an EDM before I'd do LOP, other than a demo of the fuel savings to be made. According to my logbook I've flown this particular aeroplane 700+ hours, and I've run it LOP in the cruise by default for nearly all those flights.
Last edited by Tinstaafl; 10th Apr 2014 at 03:10.