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Rick, I fly the exact same model ('73 337E) over mostly water (last trip was Friday to MYBG in the Bahamas, next trip is 8 AM tomorrow to Nassau*). If you take the factory numbers and apply about a 5 - 10% correction factor for age (e.g., less engine HP than brand-new ones used for the factory tests, greater drag than new, wrinkle-free, super-waxed airframe)
you should come pretty close to actual performance. My typical flight is at 4500 - 7500 feet. At 500 ft I reduce to 25/25 and never touch the throttle again until near landing, adjusting RPM to 2400 at cruise. So I end up with a cruise of 19 - 21 MP (around 21 at 4500 ft and 19 at 7500 ft), with 2400 RPM, and get about 140 kts over ground (with still air) and around 20 gal/hr fuel consumption (10 per engine) at 60 deg ROP (leaning to peak EGT and then enriching about 2 1/3 divisions of the EGT gauge).
Ernie
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