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When towing I run 80 in the rear and 65 in the front. When not towing I run 65 front and rear but I only lower the rear air pressure if I'm not towing for a week or more. I run 30 to 40 in the air bags while towing and 5 when not towing.
As far as Tow/Haul, I only use T/H on grades or when slowing down for a rest area or traffic. Never on a flat hiway. On a flat hiway I also tow in Over Drive and in Cruise Control and again only shift out of OD on grades or when slowing. Argue all you want but T/H does increase RPMs thus decreasing MPG. The longer the tranny takes to shift the higher the RPMs. The higher the RPMs the less MPG. You can not only see the RPM increase on the tach but I can hear it as well.
RPMs increase, Fuel mileage decreases. That is a fact of life.
This is my 2nd Duramax and only one time did I ever experience an overheat problem and that occured on a very long grade on a very hot and humid afternoon. And yes, I was on T/H for that grade.
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