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There are too many variables to give specific percentage ranges IMO. The ranges of efficiency increase would be all over the place. For example, what good are rear wheel skirts if you are doing all city driving? Do we then qualify each mod with circumstances? 2 mpg @ 60 mph? This is just one example. I think the more we think about it, the more involved it will be.
I think maybe a better way is to generalize it a lot. For example, we have three ratings for a modification; efficiency increase, difficulty, and cost. From there we can rate each of those sections with a general rating of high, medium, low. Something like this would be more possible I think.
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