Hunter of Trolls
Join Date: Nov 2012
Location: east coast
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yup.. stock, tow, street, performance..
i run the hd300 daily, almost exclusively the tow setting..
a couple weeks ago I made a run of about 350 miles each way, unloaded there, loaded back.. summer blend fuel rocks!! I managed damn near 20mpg empty, and a touch over 16mpg with a decent load chasing me..
these diesels love a constant engine speed, and their economy really shows when you can settle in for a long haul.. if you're getting 16-17 mostly hwy, you should see nearing 20 ALL hwy, especially since there is no elevation changes to speak of (unless you're going west of Charlotte or Wilksboro in NC)..