How much air is required to burn 1 liter of fuel completely?

To completely burn 1 liter of fuel, approximately 14 to 15 liters of air are needed, depending on the type of fuel. This ratio is based on the stoichiometric combustion process, which varies for different fuels due to their chemical compositions. For example, gasoline requires about 14.7 parts of air to 1 part of fuel. Thus, the exact air requirement can vary with the specific fuel being burned.