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This was answered on an episode of Mythbusters, you get better gas mileage with the AC on.
theorically driving with the windows down will use more gas due to the disturbance to the car s aerodynamics
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It is the clearing of condensation on the inside of car windows
Your truck sounds like it doesn't get very good gas mileage. Try making sure there is nothing in the bed of the truck to cause the truck to pull more weight then needed, also, make sure your windows are up at all times, so air flowing in the window doesn't slow down acceleration.
no myth-busters did a review on it and you use more fuel with windows down then you do using the AC. AC uses the same amount of gas as running with the windows up and ac off At speeds below about 30mph it is better on fuel mileage to drive with the windows down. Above 30, the drag from the open windows makews it more economical to run the ac and roll up the windows.
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When only the back windows are down, they make a thumping sound because of the air tightness of the car's cabin. Roll down a front window slightly and this will go away.
The actual windows are a great investment. New windows will lower your energy bill and increase the value of your home. The hardware that comes with the windows is not good quality.
form_title=Install Windows in Your Home form_header=Upgrade the look of your home and increase your energy efficiency by installing new windows. Have you already bought the windows?= () Yes () No How many windows need installation?=_ Which types of windows do you currently have installed?=_
Yes, fuel consumption will increase with use of your AC system. Your serp belt is only turning a free-wheeling pulley on the front of your AC compressor. When you request AC, an electric clutch behind the AC pulley engages, then your serp belt is turning a demanding compressor. This excess load will actually drop engine RPM briefly at an idle or while cruising. Your vehicle control system will respond by raising the idle to compensate. It is this compensated idle and engine load that brings you back to the gas pumps on the hottest days. While use of the AC does increase energy consumption, running the AC at freeway speeds is more efficient than opening the windows for cool air. The increased drag caused by open windows uses more fuel than the AC. Around town, however, the AC is less efficient than rolling down the windows. To reply to the answer about fuel mileage being better at highway speeds vs. rolling down the windows, this is only true in some cases. If you have a small enough engine, running the A/C at highway speeds can have a worse affect on mileage than opening the windows.
below Microsoft video explains how.