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Well, if you look at it from a physics standpoint...
20 amps * 14 volts = 280 watts
280 watts / 746 = .375 hp
Assuming that your alternator is 100 percent efficient (no, it is not) the 20 amp load would only provide a measly 3/8 hp more braking.
But... if you are in DFCO mode, all the power comes from your momentum, and any load other than brakes slowing you down saves wear on the brakes. This just won't do a whole lot. Something that would be more noticeable would be to turn on ALL loads when in DFCO, because you could probably feel that.
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