These two loads are what was on the truck for the 5.8. It was that way from the start of the load and the fuel mileage never changed. Loaded it in Marion oh for the steel and ft Riley up to ft McCoy. All from Friday to Tuesday. I wasn't in a hurry either. 66-67 mph. Cruise set right at 1500-1525 rpm.
Pulling this should have been 5.8. anything but aerodynamic.
The only thing against this was weight. I had to open the trailer tandem due to the weight being 35,000#
The 7.7 was 32,000# on the deck of concrete pole barricade. Think jersy barriers but about 2' tall and 20' long. They are used by a power company to store telephone/power poles on them in the yard. I'll post a picture of that load later today.
The 5.8 load was all Interstate roads.
The 7.7 mpg was all 2- lane, small US highway across wi/mn/wi. With lots of small town slowing down and stopping. Even that had an open tandem. Mn95 and us8 is all chip coat.
Tires? Come on. This is all in the last 5 days. It's been 80-96 degrees the entire time.
Load configuration is about the only thing going against me here on part of this thing. I had two identical loads to haul yesterday and today. The pole barricades to a new construction site 250 miles from my house. The shipper is directly in my backyard. So the routes will be the same, the load, the same. Even down to time of day.
Talking with
@Mike about this, the thought is that both my truck and
@JunkYardDog5958 truvks are hyper-sensitive to fuel quality because of the tune we have on our engine. Much like some hot rods have to have 91 octane fuel, ours require 48+ cetane or better.
@Mike has a guy in Missouri we are looking at getting some work done. He's got a "fuel modification" that supposedly allows more fuel flow and reduced fuel temperature that allows for less cetane degradation is how it was explained to me.
Considering most cetane increase is done chemically, I can see where the increased fuel temps might cook off those higher volatile chemicals.
There's been plenty of company road challenges that show similar results to what I am seeing that match. Poor quality fuel, while cheaper at the pump, cost significantly more in increased fuel consumption over time compared to premium fuel. Think 40 - 43 cetane vs 48+ cetane.