With my CAS V2 and the sensor mounted in the up pipe about 10 inches in front of the throttle body, I see temps about 12-15 above ambient during normal cruising.
Made a blast one day out on the highway and with ambient temps in the low 70's I saw the MAT at 95° on that one.
Stock IAT sensor feeding the Powerlogger as MAT, 44 turbo, V2 fmic.