4000rpm 24 knts 27.60 mph 9.5 gph 2.91 mpg
4500rpm 28.5knts 32.78 mph 11.0 gph 2.98 mpg
5000rpm 33 knts 37.95 mph 16.0 gph 2.37 mpg
5500rpm 36 knts 41.40 mph 19.5 gph 2.12 mpg
6000rpm 39 knts 44.85 mph 22.5 gph 1.99 mpg
http://www.classicseacraft.com/forum...rev=#Post45415
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To answer this thread I run 22" ss props on my twin 115 Suzuki 4 strokes and I get 28mph and 10.5gph at 4k rpm's for about 2.7MPG and that is with a full tank and 3 people. Max speed 38kts at 6300 rpm's. I may go to 24" props to drop the rpm's down to 5900 or so.
http://www.classicseacraft.com/forum...rev=#Post51742