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It's easy, think about fuel efficiency every time you use your car:
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Automakers have succeeded in cleaning up most of the harmful substances emitted by vehicles. Compared with unregulated vehicles 30 years ago, today's new cars generate 98% fewer hydrocarbons, 96% less carbon monoxide and 90% fewer nitrous oxides. However, vehicles still emit a great deal of air pollution, including carbon monoxide, nitrogen dioxide, particulate matter, volatile organic compounds and carbon dioxide. Vehicle exhaust also contributes to ozone formation.
Two factors contribute to the high output of carbon dioxide per gallon of fuel burned:
Unfortunately, car exhaust contains three major air pollutants that are harmful to public health and the environment: carbon monoxide, nitrogen dioxide and particulate matter. Diesel engines tend to produce more particulate matter than regular gasoline vehicles.
Nitrogen dioxide contributes to the formation of ground-level ozone, a fourth major air pollutant that leads to smog.
The cost of idling your vehicle for 10 minutes every morning can add up. Idling for just ten minutes wastes about 20% of a gallon of gas. It may not sound like much, but it all adds up. Think about how long do you idle each day, each week, each year? And remember, millions of motorists are idling.
Restarting just one or two extra times during the day has little impact on engine components. Restarting won't significantly damage your vehicle since the engine is already warm.