Quote:
Originally Posted by Big Dave
This has been a topic of discussion amongst Ford Super Duty owners. The general rule of thumb is to run with windows down up to about 35 MPH. Above that, the aero drag penalty exceeds the A/C load and it is better to run the A/C.
I have WeatherTech visors which are similar to your and they give me a third option in some weather conditions. I can run with the windows down to about a half inch above flush with the bottom of the Weather Techs and get decent cooling without the drag penalty. When the window gets lower than a slight overlap, you can feel the drag increase.
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mite be a worthy deal to do a yarn string wind test?
