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Having spent a few years living out in the Mojave Desert, all I can say is driving around with no a/c out there is downright masochistic. Set your oven to 450, then put a fan in front of it, then put your head in front of that fan. That's what driving around with the windows down feels like out there. There is no cool breeze, all you'll just be greeted with a blast of hot desert air.
As for windows down vs windows up w/ a/c, open windows increase a vehicle's coefficient of drag, moreso than the parasitic loss on an engine caused by the compressor in an air conditioning system. In stop-and-go traffic, yeah the a/c might be seen as inefficient, but at highway speeds, you're better off using the a/c.
Either way, it shouldn't be enough to result in a 40% difference between advertised and actual mileage
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Cameron originally envisioned the Terminator as a small, unremarkable man, giving it the ability to blend in more easily. As a result, his first choice for the part was Lance Henriksen. O. J. Simpson was on the shortlist but Cameron did not think that such a nice guy could be a ruthless killer.
-From the Collector's Edition DVD of The Terminator
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