I can't offer anything about optimum cruising speeds yet, as I've only just got the Lowrance engine gauge to talk to the GPS.
However, based upon last seasons total fuel consumption and log, I averaged 1.17 litres per nautical mile. Best fillup was 1.07 l/nm and worst 1.29. Most of my journeys are at 35kts for passages between 15 nm and 35nm.
Osprey Vipermax 6.5. Weight approx 1200kgs, Suzuki DF200.
__________________
|