Quote:
Originally Posted by rohrmann
Yeah, 65 to 68, and when not in California, and on good interstates, we cruise at around 68 mph and the tranny will be in 6th gear. I never tow without being in Tow/Haul mode and always have the exhaust brake enabled. We run 14 ply rated tires, previously G614’s and now Sailuns.
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I have michelins so I can drive 120MPH (LOL). I once read that the optimum speed for these Duramax is around 62 for good mpg and also power. I may have to bump up after this.