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For all altitudes I use 25 gph plus 10 gallons for climb for planning purposes, at 65% power, which with my intercoolers is 27" and 2400 RPM. This always results in my having some fuel margin. On a recent 3.5 hour flight at 17,000, the above rule would predict 97 gallons burned, actual burn was 93.
I have boots which slows me down, I get 210 mph TAS at 17,000 and the above power settings.
It's a '73 P337 with American Aviation intercoolers.
It has a TAS indicator (not a ring, it actually has an outer ring that moves depending on altitude and temperature), so I am telling you what the indicator says. It may be off, but it seems to match actual groundspeed and expected winds a high percentage of the time. I have never flown it over a closed course to check it.
Oh ya, I lean 50 degrees rich of peak on the cylinder that peaks first, and I do not have GAMI injectors, so the other cylinders are running richer. I have about a 100 degree spread from the coldest to hottest cylinder.
Kevin
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