producing power, heat, etc., at a rate considered optimal with regard to the amount of fuel consumed.

fuel-efficiency, noun
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We never developed truly fuel-efficient vehicles, so our foreign energy imports
  drastically harm the economy when oil prices soar.
Consumers still have limited options to find fuel-efficient cars that are
  affordable, well-built, and fun to drive.
Rates will be higher during rush hour and for people who drive gas-guzzlers
  instead of fuel-efficient models.
Over the long term, they would demand fuel-efficient vehicles.
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