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seems to me like this might be more of an intake air temp issue than an aerodynamic one, in wich case, fining where the engine picks up it's air migth be a good thing.
i've had lower FE with grillblocks that extended my coastdown, so they must have helped aero, but they blocked the area where my engine picks up air. so it removed the ram effect and made the engine injest warmer air.
decreased engine efficiency might overrule aero improvemens as these are only very effective at higher speeds. it might be the wrong conlusion that the undertray is ineffective by itself. perhaps rerouting the engine air picup migth help things.
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