Our CAT 3116 has a recreational "E" rating, max RPM 2800, cruise 2400. However the 2400 spec is way to high for how we use the boat. At 2400 she is plowing along at 10 knots trying to get up on plane, burning 9.7 GPH. We have found our sweet spot a 1600-1800, which gets us 7 or 8 knots burning a...