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Air/fuel ratio: The ratio, by weight, of air to fuel in the combustion chamber. To achieve the best combustion and fuel economy with low emissions, gasoline engines need to operate within a very narrow range (14.5:1, or 14.5 parts of air to one part fuel). Diesel engines are less bound by this ratio since the amount of air taken in by a diesel engine is relatively constant and the amount of fuel injected is varied to produce the desired power.
