Stoichiometric air-fuel ratio

The ratio at which fuel and air react without excess or deficiency is called the stoichiometric air-fuel ratio.
Rich: A stoichiometric air-fuel ratio of less than 14.7 (more fuel)
Lean: A stoichiometric air-fuel ratio of more than 14.7 (more air)
Gasoline engines can be intentionally controlled to approach the stoichiometric air-fuel ratio, but diesel engines are usually "lean-burn" because of their mechanism of spontaneous fuel ignition (auto-ignition) using the temperature rise of compressed air in the cylinders.

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