TAS
I have a 1975 P337G. My numbers appear to match SkyKing's numbers. Also, Highest I fly is 16,000 feet. Found it not necessary to go higher. Can't go over thunder stroms at 20,000 feet and the additional speed is not worth the fuel cost.
When down low in the 3K to 5K alt. on short hops to breakfast, I average 155 to 160 KTS with 30 inches and 2450 RPM settings.
Jerry
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