Just another user here chiming in. My truck has the towing package (xmsn cooler) and I'm at a fairly low altitude (less than 500' MSL), in south AL. My xmsn temp runs 140-160 most of the time. It was as high as 190 when towing a 4K lb trailor this summer, but only occational steep hills around here. I'm another #2 canned tune user until I get my modification "stuff" stockpiled. Then I'll order custom tunes and install the parts when the tunes are ready.
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