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Water injection for cooling Diesels is nice, but the water still has to be carried, even if the consumption is quite low. (I assume the 1gph stated above is 1 gallon an hour, which still adds up).
The idea of having such a massive overhead, in terms of sizing a cooling circuit and radiator for sustained full-on driving in the hottest & driest climates is, I guess, what car mnftrs have to build for, but it would be nice if, like a hybrid-electric car around town 'borrows' power from its batteries, the cooling system could borrow heat-sinking capacity at the moment when the driver needs it (say to climb a long hill) against a later time when the engine is working much less hard.... That was my original thinking and I still have little doubt it would make no difference at all to all but the most lead-footed of driver.
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