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This is curious, the "Estate Back" (think of a Chrysler 300 wagon) has a higher Cd than the "Fastback".
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Dodge Magnum?
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rather than with a 1/5 scale model (whose aerodynamic results are generally about 20% better), but also whether the car was a real one, and loaded...it is much easier to achieve good aerodynamic results with a large vehicle than with a small one.
..........any takers?
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It's just a poorly written article? But it is possible to use more relaxed curves on a larger vehicle and elements like doors and headlights don't scale.
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The spoiler improves the CxS by 2.7 %, the aerofoil by 7.5 %. Both together improve the CxS by 10 % and reduce petrol consumption by 7.5 % at 120 km/h (74.6 mph).
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If they re using the spoiler and aerofoil together, what the odds the aerofoil is at the front, e.g., air dam/partial bellypan? "improve the CxS by 10 % and reduce petrol consumption by 7.5 %" might mean high rolling resistance. Or the Cd%/2=mpg% rule of thumb may assume a lower speed. 60mph vs 74mph might account for it.