[macojoe]

I had the same motor I have no idea the hour rate but can say i got 2.5 miles a gallon on my 1975 V20 Cuddy, empty with me I hit 40 mph, loaded with 3 guys and gear, top 35, and curz nice at 30 mph

that was on a I/O Hull converted with a stainless marine bracket.

Hope that helped