While modern fuel injection systems and emissions controls have lessened the need, the issue remains a contentious one.
In fact, it can be unsafelet alone uncomfortableto drive a car without first warming up the engine.
How Much Does Idling a Car Cost?

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The cost of an idling engine depends on a lot of variables.
If you have a larger engine, then you have to figure it will cost more.
Is It Cheaper to Use a Space Heater to Warm up a Car?

Four-wheel drive and traction tires can both help prevent situations like this.Hugh Whitaker / Image Source / Getty
Depending on where you live, that amount may be slightly higher or lower.
Does Running a Car Heater Use Gas?
Running the air conditioner consumes gas, but cranking up the heat does not.
Cars always use gas when the engine is running, even while idling.
That waste heat is either dissipated or used to warm up the interior of the car.
Is It Necessary to Idle a Car Before Driving It?
In most cases it is not necessary to idle a car before driving it.
Older vehicles that lack fuel injection systems are an exception.
Should You Idle Your Car to Warm It Up?
You should warm up your vehicle if it is carbureted.
Newer cars that use fuel injection and computer controls are good to go without idling.