What's your cruising speed.
We run the engines (FL120s) at about 1700 rpm which gives us a cruise speed through the water of about 8 knots. Used to be a tad over 8 knots but we had the props pitched down*a few years ago so now it's usually a wee bit under 8 knots.
FL120s are happiest in the 1600-1800 range and running them any slower than 1500 rpm runs the risk of not getting them up to temperature.
We don't like cruising at 8 knots--- we'd rather be doing 18 or preferably 25--- so we are not willing to slow down any more no matter how much fuel it saves. Fuel is the cheapest thing in boating anyway--- if we were concerned about fuel burn and cost we wouldn't be boating at all.
-- Edited by Marin on Wednesday 21st of December 2011 07:04:47 PM
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