The shark design would probably be best with a belly pan. Would you be willing to do an air dam just pass the engine bay? This would increase warm up times, Add safety towards your engine/tranny in case an object gets in there as well and would help in FE. Considering FWD vehicles most the under-body is already pretty smooth.
I see the blunt air dams as helpful, but it would add frontal area so the gains would be less than the combo
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