At the airlines I've worked, by default all takeoffs were reduced thrust unless something specific prevents it, like slush or snow, terrain, temperature, etc.
I would that 3/4 or more of part 121 takeoffs are reduced thrust or derated takeoffs.[/quote]
And the primary reason for using reduced take-off thrust is which of the given reasons (fuel, wear/tear, or noise) - or something else?
USMCFLYR