[Big Dave]

Let me echo what Bondo said.

A few observations.

1) You'll probably want to do a beta version reducing weight and improving details. I haven't yet but that is due to good results and my own laziness.

2) Insetting the lid maybe a quarter inch or so does not foul up the air flow and eases fabrication.

3) As you know, windows are a complication, and I question just what you can see through rear windows laid over that far.

4) Good MPG tests have to be fairly long (I used at least 1,000 miles) to average out variations in weather, traffic, driving style, and filling inconsistencies. Like Bondo said, as time goes on the result will improve.