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I have more than once flew the 4 compass headings, recorded the indicated airspeed and the GPS airspeed for each direction and did the math. When I land and hold it off until it stalls, the airspeed indicates 40 MPH Don't think that a standard 1960 172 can do that. I will try matching the...

We checked that.

I have a 1960 Cessna 172 with a newer heated pitot tube. The airspeed indicates 10-12 MPH slow at cruise. It has been to the Avionics shop[ for two days and everything tests 100%. They can't figure out what is wrong. Does anyone know if there is any difference between the newer style pitot...