Thanks for the candor. It was more a matter of inaccurate locations chosen for mounting than any inaccuracy of the OAT sensor. For instance, in RVs, an easy (common) location is to mount the probe in the NACA inlet. Unfortunately, as many of us have found out, it reads 5 to 6 degrees high there. Would have been nice to just minus that out. I had mine there and moved it today to a more benign location.