What is the ratio of air to petrol in gasoline engine when the car is moving?

The ratio of air to petrol in a gasoline engine when the car is moving is typically around 14.7:1. This means that for every 14.7 parts of air, 1 part of petrol is used in the combustion process. This ratio is known as the stoichiometric ratio, which ensures efficient and complete combustion of the fuel-air mixture.