"efficiency" - key terms from Wikipedia

aerodynamic efficiency
algorithmic efficiency
allocative efficiency
antenna efficiency	factor
battle efficiency
braking efficiency
carnot efficiency
collection efficiency
combustion efficiency
compression efficiency
conversion efficiency
core thermal efficiency
cycle efficiency
economic efficiency
efficiency
efficiency	due
efficiency	map
efficiency	wages
energy conversion efficiency
energy efficiency
energy efficiency	ratio
engine efficiency
exergy efficiency
fuel efficiency
high efficiency	solar cells
higher efficiency
increased fuel efficiency
luminous efficiency
maximum efficiency
mechanical efficiency
mental efficiency
overall efficiency
pareto efficiency
photosynthetic efficiency
power efficiency
production efficiency
propellant efficiency
propeller efficiency
propulsive efficiency
pump efficiency
quantum efficiency
reflection efficiency
rotor efficiency
round trip efficiency
spectral efficiency
tax efficiency
thermal efficiency
thermodynamic efficiency
use efficiency
water efficiency