Eficiency or Efficiency: How To spell?
The word Eficiency is misspelled against Efficiency, a noun meaning "The quality of being efficient or producing an effect or effects; efficient power; effectual agency."
Efficiency has double "ff" is mispronounced as "f"Remember double 'FF' in between the strings E & iciency which should not be misspelled with single 'F'
Wrong Spelling:  E-f-iciency  Correct Spelling:  E-ff-iciency 
Find more wrongly spelled words of Efficiency to spell it well.