Fact or fiction: you need to warm up your car in the winter

Have you ever heard that you should warm up your car before you drive it in cold weather? It’s a commonly held belief. When a vehicle is parked or sitting with the engine running, it’s called idling—a practice that wastes money and causes unnecessary vehicle emissions. If each car in the United States idled just 6 minutes a day, it would waste about 3 billion gallons of fuel and $10 billion. Idling Has Health and Environmental Costs Cars produce emissions that contribute to ozone (smog) and particulate matter (haze). When your car is idling, it is getting zero miles to…