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Hey Daox! I remember you from Tercel Online. To see what the air's doing on your rear window, cut a bunch of pieces of yarn about 2" long. Then tape them all over the window. The "tails" will act like little mini windsocks to show you the direction of the air flow. Sport Compact Car magazine did that on a notch-back 240sx. The article was to show how vortex generators decrease the size of the low pressure zone behind the rear window. They used AirTab vg's.
As far as I know, the optimal length to width/height ratio is 7:1. Therefore whatever you can do to lengthen the rear deck (or roof on a hatchback) may very likely lower the drag coefficient.
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