I did a little research on pump flow and efficiency. The article stated that cooling could be enhanced because less vanes slowed down the flow. That's not true. The flow at low speeds should be roughly equivalent. At higher speeds, the efficiency of the pump falls off and the discharge head is reduced, that means that maximum flow of the pump is reduced, power required is tied to flow, not pressure, Pressure is tied to the combination of flow resistance (friction) and the radiator pressure cap.
The pump will produce more head than is required and will actually heat the water up due to energy absorption when it can't use all the flow it's speed generates, much like a water brake on a dyno. That would explain the power gain from less vanes.
At highway speeds, it would appear that it might actually be true that the pump will cool better because of these reasons and not because of slower flow.
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Rich
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