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The Robertshaw thermostat division based in Knoxville TN was bought by Siebe Automotive about 5 years ago.

If you use the engine data of a 1999 4.7V8 and plug it into PerformanceTrends Engine Analyser 3.0 it will give you a graph that matches the factory graph within 2 ft lbs of torque at every rpm.

If you then change the coolant temperature from 195 down to 180 degrees there is about a 2 ft-lb LOSS of torque up to about 2700 rpm, then a GAIN of 2 ft-lbs at 3500 rpm. Peak HP goes up by 1 at 4800 rpm

If you plug 4.7V8 engine specs into the gear ratios, weight and aerodynamics of the 2003 Ram pickup, Performance Trends other program called Fuel Economy Calculator predicts that at a steady 70 mph on a level asphalt road with no wind, going from a coolant temperature of 195 down to 175 will drop the MPG from 15.45 to 15.37
 
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