I was always taught to use full power until you get to a safe altitude (typically pattern altitude). When I started to fly my RV-6A four years ago I wondered whether I really needed full power on every take-off, after all I am in the air in 500 ft, but I still use full power. Now in the cold of STL this winter I have been again thinking if I ought to use less then full power as the plane is even more peppy. Just wondering how many people use less then full throttle for take-off.