I got home. 1900 miles. Ran good. 7.8mpg pulling 43k lbs from Idaho to Kentucky. Was 8.4mpg until I hit I-70 through Missouri. Hate that road. Truck pulls really hard. Series 60 doesn't seem to have the low rpm lugging power of the D13 but get it up around 1500-1600 rpm it pulls like Satan getting his butt kicked. This definitely rides nicer than my 2013 670 did.