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People don't post their Cd numbers because it's a pain to calculate them. An extreme example of aeromodding is Basjoos' Aero Civic which went from .31 to .17 Cd. But yes, you'll have to look at frontal areas too if you're doing a numbers game.
Why not just swap in a higher 5th gear and call it a day? Or buy a tiny car like a Metro or Festiva and aero mod that? A Saturn seems like an odd place to start from scratch.
.28 should not be very hard, by the way. I imagine with a boattail you'd be pretty much there. Although admittedly I'm as clueless as you are about what mods will improve X amount. Usually people are more interested in hitting a certain fuel economy number than a drag number.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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