I had this idea on how to decrease the aero-penalty of cooling your engine:
(coolant flows right to left in the picture)
By making the radiator behave more like an opposing flow heat-exchanger it should be possible to reduce the amount of air that needs to flow across it. Since most radiators are over-sized for ecomodder needs, the decrease of max cooling power should be no problem.
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)