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IN your case you may benefit by having a cooler thermostat, but with the load you are pulling, it probably wont help a whole lot....
Your thermostat is fully open, and your still hitting 225, all a cooler thermostat will do is allow it to stay cooler at the start of your run or pulling.
And around town, you will run alot cooler....
Yes i sure the thermostat is part of the bigger picture when it comes to emissions, but you cant deny the fact that, you need heat for a diesel to run properly, and most efficiently...