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i have a 08 duramax ext cab, 4wd
undernormal not-towing, it hovers around ~70' above ambient air temp at hyway speeds.
towing my 5er, it is about ~90' above ambient. these are rough numbers because of variable's such as humidity and such.
But i know that if the temp gets much above the "average" then i need to be wary of things.
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