For kicks, I would consider adding a removable kamback so it makes the overall shape of the Saturn changes to a hatchback like shape (Prius anyone??). I don't plan on selling the car so it doesn't matter what I do. The prototype items that I would use is wood, plexiglass, rubber trimming, various bolts and paint. The extra space won't using like AeroCivic, but it would achieve at least 60% of the benefit.
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