eli5:Why do cars consume more fuel in cold weather?

Question

I noticed my car burns more fuel in winter. I don’t use the heater or Air Con. So all being equal why more fuel? Is it something to do with Oxygen density in cold weather? If so, please explain 🙂

In: 9

Answer 1

Air fuel ratio. Colder air is denser than warmer air so more air is going into the cylinders requiring more fuel for proper ratio.