doesn't matter, even with front windows open it still actually pulls air in the back. aerodynamics are not as simple and straightforward as you are thinking, opening the side windows and the rear window, you still get some rear to forward air flow. in fact, if you put some string and tape along the rear window, you would see that different parts of the opening the air flow is in completely diff directions.Are you keeping your front windows closed?
Also, you smell like a gas can because you're driving around in an '84 K5.
or you could go for a ride with my in my 86, I smell like exhaust all the time when I have the windows open.
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