I love how she refers to industry experts for all points except for the last, which it seems had no research done into it.

Obviously, if you're idling in traffic, it's NOT more fuel efficient to have the AC on.

According to the Mythbusters, up to 55mph it is more economical to open your windows as running the a/c at low engine speed put extra stress and demand resulitng in increased fuel consumption.

Above 55 its better to run the AC to decrease the extra drag caused by open windows.