I don't want to muddy up your thread, so I sent you a PM.
My company office is a 2011 Dodge 3500 dualie with the Cummins, 348K on the odo. Half those miles are pulling horse and stock trailers. Towing it gets about 7-8mpg, bobtailing about 15mpg. 95% of those miles are highway.
What kind of down time have you have with 348k miles in 3 years? That's a damn lot of driving!
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