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To me you should have done another test after putting the fan back on just to make sure that it wasn't something like your fuel being warmer (return line from the engine) or tires being warmed up.
but all in all, your fan is running at crank shaft speed, right? if you put that fan on an electric motor and ran it at the same speed how many watts would it pull?
Our truck at work is used as a truck towing near it's own weight half the time, so from that point of view it's most likely using the cooling of the fan while it's running and converting mechanical energy to electrical and back to mechanical seems like a round about way to get work done, but for your use it seems like it's not needed very much.
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