No it is not. But I have heard it could be damaging over time to the A/C compressor to turn off the engine with the A/C on.
Because a car can turn fuel into power more efficiently that you body can.
The engine works more efficiantly as the air is denser when cold, more fuel can be used allowing for more power from a smaller engine
It won't do anything if the fuel injection goes out. IF the car is running fairly well but knocking, it's not the fuel injectors. You have more serious problems within the engine.
Well, the turbo charged car has a turbo hooked up to the engine. What a turbo basically does is to force feed the engine with more air + fuel, making it possible to get more power out of a smaller engine.
That depends on the model of car, some cars are front engined and some have the engine in the rear. The fuel filter can be placed anywhere between the fuel tank and the engine but it is usually in the engine compartment.
a car with a combustion engine
If you mean does the A/C cause the engine to use more fuel, the answer is yes and no. In city driving the A/C does indeed cause the engine to use more fuel. On the highway at speed, the engine uses about the same amount of fuel with the A/C on as with the A/C off and windows down. It also depends on the model year of the car. Older cars have A/C compressors that require more power to drive.
More fuel economy
No, of course not. The fuel pump supplies fuel to the engine. The engine will not run without a supply of fuel.
When it comes to fuel efficient and luxury cars the best bet is to compare hybrid-engine designs. More and more luxury car companies are now coming out with fuel efficient hybrid-engine designs.
There is no other way for the fuel to get into the engine.