Engine Thermostat Temperature ?
I noticed that my engine's coolant temperature is only around 1/3 up on the gauge and the digital temperature is 192 degrees. Most vehicle's are arranged so that normal operating temp. is in the middle of the analog gauge and I know that engine's efficiency is best when running hot.
I also have found that in cold weather, the heater temp. is not too great.
I called Cummins and they gave me a thermostat part number of 4929644, with a modulating range of 186 to 207 and max. of 225.
I couldn't get to a good tech. person and I am not sure if my 192 degrees is correct. This not necessarily a problem, but for efficiency, every extra 1 MPG is a blessing.
Has anyone explored this subject?