[aerohead]

I ran an energy balance for all the Subaru configurations.
The conditions were:
65-mph ( 95.333 feet/second )
estimated Af= 23.8153 sq-ft OEM, estimated 24.4394 sq-ft with airdam
rho = approx. 0.0023256823
Cd 0.29 ( CarsDirect.com )
tires- 205mm width
REGULAR Unleaded, reformulated gasoline @ 111,836-Btu/gallon
6.138-pounds/ gallon
CVT transmission of 87.71% mechanical efficiency
40% thermal efficiency for engine
2546 Btu/ brake-horsepower
2.2% engine accessory losses
Rolling resistance power absorption is carried as a constant
Brake Specific Fuel Consumption ( BSFC) is carried as a constant
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configuration-1: Cd 0.29, CdA= 6.9064 sq-ft, 35.644-mpg
configuration-2: Cd 0.214, CdA= 5.0981 sq-ft, 40.528-mpg
configuration-3: Cd 0.2671, CdA= 6.5289 sq-ft, 36.5637-mpg
configuration-4: Cd 0.1764, CdA= 4.3114 sq-ft, 43.0971-mpg
configuration-5: Cd 0.2291, CdA= 5.5467 sq-ft, 39.4562-mpg
configuration-'6'* Cd 0.1721, CdA= 4.2060 sq-ft, 46.5376-mpg
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'6' represents a 17.3% radiator blockage to compensate for a now, 'oversized' radiator area.
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The 'source' flow for the underbody and diffuser originates at approx. 16.11-inches above ground level before displacement. The separation edge for the slanted diffuser should not be any higher than 16.11-inches, as, at this elevation, the displacement kinetic energy nulls, and constitutes the 'reversal point.'
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Additional 'fruit' which lay outside the scope of the Impreza project, if added, could easily bring the Subaru into Cd 0.145 range