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There is a lose in aerodynamics with the windows open.
When I had my 1999 Vanden Plas 4 door Jag, I ran with the windows down on a route I was driving everyday. I ran at 60mph w/cruise set for 16 miles. When the windows were down there was a lose of 4mpg (running a scangauge) with the windows up and a/c on I got 26.2 mpg.
Is the report stating that there is a drain on the engine even with the a/c off? couldnt be more that 5% (imho)
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