In cold temperatures yes, once the engine is at operating temperatures or in warm temperatures no.
Cars will use more gas idling than starting the car.
It is more than likely a thermostat
The same on a car equipped with manual transmission. On an automatic equipped car it will use less idling.
It depends on how long you are idling, or how fast you are going. If you know you are going to be idling for a long time, it's best just to put your car in park.
I sat in my car in the driveway with the car idling, waiting for the kids to come out.
it depends on the car. a low-emission car will produce less carbon than a car with bad fuel economy. if a car is idling (not going anywhere) it may produce up to 80% more emission.
The condenser fan is more likely to run when the car is idling. So if it NEVER comes on when idling you definitely have a problem. If the condenser is not cooled, then your compressor could get overloaded. It may be a problem with a relay that is preventing the fan from running - or some other issue.
Try getting the fuel injectors cleaned. They had to flush mine twice at the dealership. Cost less than $200. Was well worth it.
it means the motore is rotating faster a dead stop than it should be.
Most car care sources say warm up is unnecessary as modern cars have fuel injection not carburetors. Idling your car is hard on your engine and gas consumption. In addition if you use a synthetic oil it does not change viscosity when cold and does not require heating to flow properly.Warm up should last no more than 30 seconds while you check the window visibility. Starting to drive will heat to the cabin quicker than idling./.
Idling is what your car is doing when it is just sitting somewhere running. As soon as you press on the gas it is no longer idling. Your idle speed is the number of RPMs your engine runs at when you are idling.
Again depending on age could be choke not working properly Could be a vacuum leak check connections depending on the car.