I keep my Mooney with IO360 hangared and have a small heater that blows into the engine cowl. I shoot it with an IR gun for a temperature reading and I usually have 60 or 70 F when I get it out and start it. Saturday morning early and this morning early I rolled it out and started it in about 35 F ambient temperature. I kept the Rpm very little above idle and slowly taxied to the run up area and waited for min oil temp before doing a run up. Both days when I made my first takeoff with everything to the firewall, I only got about 2,560 RPM on take off. Both days I flew about an hour before coming in, then did another takeoff. Both days on the second takeoff I got a normal 2700 RPM. In Winters past, regardless of oil temp I always had max RPM on take off. Is this pointing toward a prop governor that is asking to be serviced? Thanks in advance for sharing your experiences.