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I think part of the problem is that using coolant isn't necessarily 'waste' heat. You're not going to gain anything in warm up if you're taking heat out of the coolant with another heat exchanger.
Longer warm ups could negate any gains from a WAI on trips up to ~10miles - keeping in mind that a hypermiled car take a long time to warm up at the best of times.
My newer cars are designed to run with the thermostat only partially open. The radiator is barely warm after a drive even on the hottest of days.
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