The gear ratio I have is 1.61:1, which was suggested to me as ideal for the diesel, the V8's were not a high reving engine. I did use this ratio in the prop calculation, plus I bumped up the weight of boat ( to allow for the beer on board ) I have not checked the max off load revs. I will do it this weekend. The engine was re-built, injection pump serviced and calibrated etc. before installation. At 1100 RPM, 6-7 MPH, I'm using just over 1 litre per hour, that is quite amazing compared to the V8.
Paul