Targa 32 Speed and consumption test with clean hull and sterndrives.

The test with clean hull and sterndrives gave about 1 knot more top speed. I got higer RPMs. The load was about the same in the 3 tests I have done so far. The final test will be with light load. Can I manage the factory speed of 40 knots for this boat with twin D4-300? More about the boat at this site: http://tranby365.net/targa32/index.html