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I remember a post by aerohead where he quotes an 1986,SAE Paper 860211 showing that a 15deg hood slope can reduce cd by .0475. That is pretty huge! It is from the technology of cars of the era that my car comes from. When I made the hood splitter I shot for that angle, 15 deg.
So if my car has a cd of .36 stock that and the paper says 16% less wind drag, that makes it about .31. If half of my drag is from aero that means that I might have 8% less overall drag. My previous tank was 47.7 mpg. An 8% increase says 51.5 mpg My car got 50.1 over 500 miles.
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– Noah Webster, 1787
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