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Thanks.If I understand you correctly, you are envisioning attaching something to the rear, and not the car body. It is very clear that the simplest thing I can do for a start is fill in the space between the back bumper and the rear frame. The rear frame member runs transverse at the end, and then there are brackets bolted to it and a bumper bolted to them. Both of these areas are acting as parachutes now. While covering the space between the two is a small thing, it is maybe a start. There is a space of about a foot between them.
I went to a car show yesterday with the Dart, and went around looking under cars. There is a guy who shows up with a 64 VW beetle regularly, and I was especially interested in the bottom of that car. It is completely flat. It is about as flat as you could imagine the underside of a car being. I had one of those back in the day, and it always yielded 32 MPG regardless of how you drove it. I am sure that flat bottom, among other things of course, helped the efficiency of that design. You have to wonder how well that car would perform with more modern technology in the engine?
Sam
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