If however, I operate pistons again then maybe I'll look to build on what I learnt about piston engines all those years ago. But until then, zero benefit from an APS course.
dont they offer a 100% money back guarantee if you feel you gained nothing from the course?
and since when has any education been of no benefit? i am willing to bet i could tell you more about your engine by doing a mag check at cruise power at TOD than you could ever gain by doing the same at runup.
i have done the course, and fly behind non mixture equipped aircraft 90% of the time, and when i am flying anything Lycombing or Continental powered, its only fitted with a single EGT probe, and the lessons learnt at the course help me understand whats going on with those aircraft as well.