Does anyone know anything about the true efficiencies (output power to input
power) of Minnkota or Motor Guide trolling motors. I have questioned reps of
both companies and they deny any knowledge of the efficiencies.

If one assumes 70 lb thrust is about equal to one horsepower, then you can
calculate the efficiencies of the Minnkota units from published voltage and
current ratings. They run 65% to 100%+. If you do the same for the thrust vs
kilowatt specs cited in the Motor Guide owners manual, all of their motors
exceed 100% efficiency (like to have some of them!).

Anyone know the truth?

Bob Swarts