If you're a good driver, you might observe that most of the time people say that driving when your OECD is on causes lots of fuel and most people trying to do that and manage their kids, they will off the AC sometimes, especially when they are driving alone. But in the real world, most of the cause of fuel consumption is when you wind the window down because it burns more fuel.
Let me explain this phenomenon, this creates a highway speed cause it creates more aerodynamic drag. As air rushes into the cabin, this disrupts some smooth air flow so that forces the engine to work harder. But with AC on and the windows closed, you can remain more aerodynamic and move through the air, which is more efficient.
I hope you learned something today. Don't be confused about the phenomenon of your AC consuming fuel. Fuel is not true. It is more of opening your window that consumes more fuel than leaving the AC on.
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