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1. Light pressure turbo would help reduce pumping losses, I think. Sucking air through the throttle uses energy; so pushing from the other side could help mitigate that.
2. I looked at the pic of your car. I suspect you're paying a small penalty with the spoiler, but not much.
4. DIY aero hubcaps are the only way they'll pay for themselves in a reasonable amount of time. Search around, folks do it with pizza pans and it doesn't look bad.
5. Take a look at the link in my sig about tire width/rolling resistance. I disagree with BEEF; it is my belief (based on the science presented in that thread) that wider tires have less rolling resistance than narrower tires (given that they're constructed and inflated the same).
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This sig may return, some day.
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goofy1 
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