How much gas does a car use to start?

Answer 1

How much gas a car uses to start depends on the ambient temperature, humidity, the particular engine used, the carburetor or fuel injection system on the engine, and the accelerator pump, or cold start fuel map used. On a warm dry day, a well tuned engine need consume no more gas at startup than it does while idling for a few seconds. In nonoptimal conditions it may require an injection of additional fuel through a cold start valve, fuel injectors, or accelerator pump on carburated cars, in order to start. This amount of additional fuel can range from 0 to 300cc in the worst case I have encountered. Additionally, in cold weather, once a car has started, it may need to remain on high idle for a few seconds before it is ready to drive. This consumes additional fuel.