Thanks for all the responses Gents. On the fuel burn from Capt. J - does the calculation take fuel returned to the tanks into consideration? When I refuel and do the math it does not seem that I am burning as much fuel as the displays show. Also, Capt. Ralph - all the work that was done by the yard was top notch, BUT, have not ruled out a dropped prop on reinstall. The tachs are fairly frustrating to interpret - CAT LCD displays and the readings are constantly jumping all over the place, sometimes as much as 20 RPM or more. Only had the boat since May and am working through all this "stuff" to be sure the engines are performing as they should and not in an overload situation. To that end, I have scheduled the CAT boys (guys here on the Chesapeake who I trust) to get on the boat with computer hooked up, sea trial and analyze exactly what is going on. This soiree will include replacement of the old "beer can" style TPSs with 21st century units. This not to occur until next month. Will report back findings/solution. Thanks again for all of your responses!