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Keep EGTs low and combustion temps high. Some guys install custom higher temp (203*) thermostats to at least keep the coolant temps high. I used to drive by EGT when I had the old '96 F250 PSD and a set of gages. I tried to keep it below 600* at all times while unloaded. My Dodge 24v 5.9 is currently gageless (!!!).
Keeping the RPMs on the high side while towing and towing uphill will keep the EGTs down, vice keeping it in the peak torque and most fuel efficient area (around 1750 rpm).
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