From experence flying garretts in southern europe +30 and north scandanavia -20deg its like flying a different aircraft. That 50degs gives you another 25% torque in cruise for a start at the same level at max egt.
Very true. I actually flew the Metro in Colorado and the surrounding states. Density altitude in the Rockies in the summer was frequently over 10K at take-off. Available power was about 65%.
