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Mudflaps are sending out a new controller, not a problem.
This mornings 30+ mile drive in stop and go traffic didn't even test 1 fan.
This afternoon's return trip in ~80°F ambient temp also want a problem.
A single fan is doing better than the standard fan, and I can definitely notice the additional power this has freed up... it is not breakneck, but I'm happy with it.
Give it a week, and I'll see what it has done for mileage.