Derated engines

[wangus]

based on the fact that MTOW can be achieved with full thrust and MTOW -x% can be achieved with derated thrust, so presuming payload is the same, then fuel capacity is reduced so range is reduced.

Ummm. Correct me if I'm wrong, but surely an aircraft at it's MTOW, subject to Temperature, Airfield Elevation, and Runway length, could easily perform a take roll at MTOW and reduced thrust???? In my days as a load controller we regularly had to remove some of the traffic weight to allow loadsheet / aircraft weights to not be exceeded. Take-off briefs still mentionned reduced thrust take-offs. I may be wrong,but agree with iceman50. (I recall A320s at MTOW and whatsounded to me like incredibly derated take-offs with N1 settings in the mid 80%s at LGW.)