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To expand on my guess, without editing my post...
I would assume that downforce would work out to mean more rolling resistance, as the vehicle would behave as if it's heavier the faster you go...
Therefore neutral would be better for FE, presumably. And no loss of traction at speed. Of course, if it only weights 50lbs, you might want downforce at speed to keep you grounded. Bad things might happen when you catch air, though...
If it's heavy, they might have designed it for a bit of lift, to reduce RR the faster it goes.
Too much lift sounds like a bad idea in general.
Of course, if it only goes 30km/hr, lift and the Cd are both pretty moot points...
YMMV.
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