The Cessna 4000 is a beast! No better certified single engine piston out there if you are looking for speed! :-)

Here is some footage of the flight and engine instruments to give you an idea of what kind of real world cruise performance you can expect from a Cessna/Columbia 400 at 14,000 ft. Temperature was pretty close to ISA and I'm running lean of peak. About 16 GPH, keeping CHTs below 360. The aircraft is equipped with TKS and A/C.

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