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From my work at the rocket site: thermocouples are extremely linear (at least the JK ones we used) so manufacturers have resorted to some sort of gauge tampering for whatever effect they desire. The advantage of computer control is that mostly you have access to that data being read, realtime.
My F250 with it's 8 gallons of diesel heated coolant takes 5 miles of loaded travel to have effective defrost, 10 miles to have a warm cab in 30 degree weather. At idle it looses as much heat as it produces.
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