These cars came with a partial front pan. I bought mine new but it was damaged in an accident and the body shop never replaced it. I didn't know till later. You might find one in a junk yard. I built a new one out of a piece of roofing steel I had. It added 3-4 MPG.
While I was hanging around the front of the car with my camera, I lay down and got a picture underneath showing the drastic need for a partial belly pan (at least).
I think I shall follow the herd on this one and go with coroplast (any local elections coming up?), but I am thinking some aluminum or sheet tin would be better closer to the hot bits. From those of you with experience with these things, would alum rivets be a good method for attaching aluminum to coroplast? or would they pull through the plastic over time? Perhaps washers to spread the load?[/QUOTE]