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The radiator fan can pull some decent power, and alternators aren't that efficient. So, the fan should be avoided. However, if it only comes on 1-2 times on your trip, I'd just leave it.
On my Prius, I run a full grill block all winter unless I'll be going on the highway. Then, I remove one of the pipe insulation strips from the grill. That allows for plenty of cooling.
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