Yesterday I went and did my MPG test run and came out MUCH better than I thought I would.
I did a round trip from Mid town kroger fuel stop in Ashland Ky to Grayson Ky and back. THis is a mix of about 10 miles of highway with red lights and with the rest being rolling hills on I-64.
I did not try to drive for max MPG I ran 65-68 on flat ground and held to floor on the hills. It only dropped 4 MPH in top gear on any of the hills.
I drove it like this to get a worse case idea of MPG.
I made sure to use the same pump and fill to same point (lower lip of filler pipe)
Result was 49.4 miles and 4.2 gallons of fuel used for 11.7 MPG.


I had heard these 12V cummins got good milage, but I didn't know it was this good.
I was told the higher gears would pay for themselves.