Mark, See my previous post... No, we don't have FloScan meters, I wish we did! Unfortunately, they're quite expensive and somewhat complicated for a twin diesel. Nevertheless, I am considering installing them. (I'd love to know the exact figures too.) You're right, it does appear that the boat has two optimal speeds. We get about 7 knots at a mere 1500 RPM. At this speed (which feels like a fast idle) the boat is so quiet we're always surprised to see 7 - 7.5 knots on the GPS. But, much like a planning, or semi-displacement monohull, increasing the throttles from 1800 to 3000 RPM seems to increase the wake size but not to offer a commensurate speed increase. From 3000 RPM on up to WOT (3800) the boat feels as though its planning, the bow actually comes down a bit and the wake gets smaller. At engine speeds above 3000 RPM there is quite a bit of noise in the main cabin. (This can be reduced slightly by closing the aft cabin doors.) It's not really objectionable - I believe PDQ has the actual figures on their website. However, up on the flying bridge, where I normally am in fair weather, it's very quiet. At 7 knots you hear the water noise above the engines - reminiscent of sailing! At 3200 RPM (16-knots) you're aware of the engines, but you really have to listen carefully to tell if they are synchronized. (Not that it really matters - unless you've got OCD - like me!) Neither Nancy or I have found noise to be a problem. (But you're right, it's hard to make a light boat quiet.) Henry Clews aboard Sno' Dog in Newington, NH www.geocities.com/snodoglog In a message dated 7/25/2006 11:40:56 A.M. Eastern Daylight Time, mark424x@yahoo.com writes: Henry, 5gph at 15knots is quite good. Do you have a fuel flow meter - just curious if the consumption is fairly linear with speed up to that point or if there are big gains by dropping back to ~11-12? It seems that most folks either stay at 7-8 or crank it up to 15-16 if they are able. Could you also comment on the interior noise at cruise. Often the lightweight designs don't do great with noise isolation. Thanks, Mark