Just a thought, Pinecone. 365 KIAS at 10K feet and 50F = about 445 KTAS (Knots True Air Speed). I imagine performance data for public consumption generally is expressed in TAS because it is more straight forward from the layperson's perspective. As we know, Indicated Air Speed is nothing more than the rate at which the pitot tube impacts air molecules ... of which there are fewer as pressure decreases (altitude or temperature increase). Ergo your "true" speed through the air mass is greater than is indicated by the air speed indicator.Ted Fancher