Mike Y. just posted an answer containing the following:
With today’s fuel costs, the Carson cruise angle of attack, which represents the most efficient way to fly fast with the least increase in fuel consumption, is of significant interest.
Being an outstanding human, Mike also added a reference to the document that it came from:
"Low-Cost Accurate Angle-of-Attack System", Borja Martos and David F. Rogers, Journal of Aircraft 2018 55:2, 660-665
But for those of us who don't have access to that journal or can't be bothered to go find it, what is Carson cruise? What exactly are the benefits and how is it determined? Finally, can I determine it myself for my airplane without an AOA indicator?