A perfect match prop (pitch and dia.) plus the
installation of an adjustable carburator main jet will make these old
engine very efficient 'fuel-wise'.


I found my A/4 going down the ICW was using about 1/2 gallon/hour, though I
wasn't pushing the boat speed. The only problem I had was that aftermarket
fresh water cooling pump. I eventually took it out of the loop and used the
engine raw water cooled just fine.