You're wishing for a 50% increase in efficiency.
Quote:
1. Less bricky- I'll chop off the sleeper
2. All wheel wells covered, Also side skirts added
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4. Build small truncated tail
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6. Front air dam and partial grill cover (lots of wasted flat spots)
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These could made some degree of improvement, depending on how they're done; The others are fine tuning. IMHO, even if done perfectly, they would only get you half way there.