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Ok so I've noticed this winter that my truck is running about 100 degrees hotter (800*) on my way over a mountain everyday on my way to school. In the summer I run at about 700* on the same mountain. The only difference is I'm running on my 235/85/16s now and running winter blend (white bottle) powerservice, in the summer I run my 315/75/16s and the silver bottle powerservice. Also in the summer I never have the A/C on and in the winter I run with the heat or defroster on.
On another note I was very happy at my gas station today. I began to pump my diesel for $2.57 and the guy came over to change the sign. I said, "I guess I'm not getting this fuel for $2.57 huh?" He said, "Nope your getting it for $2.53"! He took my reciept in a gave me the change in cash. Just another reason I will continue to fill up every time at that Phillips 66.
AC & defrost arun the AC pump maybe heat too? It's off on vent.
Anomaly? Maybe the powerservice is making it run a little hotter, does it boost the cetane? Can't remember.