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I put the 203* thermostat in mine. Not sure how much it helps but it makes sense. My EOT never goes above 220* or so and that is towing a 9k camper in warm temps. I think the cooling systems on the 7.3 pigs are way overkill. Just the tranny coolers were suspect while towing.
I need to start doing some removable grill blocks. We only tow every 3 months or so and then it's usually a good bit.
I have raised my mpg's by 2-3 when not towing by driving habits. I have gotten over 18 most tanks not towing and excluding a few 700 mile overnight trips where perhaps I sped a bit (still 16.5 and 16.8)
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