Australian fuel consumption figures

80,000 pounds is generally the maximum, often lower, no road trains like you have
How heavy and how many trailers and what lengths can the trailers be? What are the maximums?

 

Not sure really then. Some drivers here don't haul heavy very often and may drive on flatter ground. I am almost always between 78000-80000 and I get between 5 and 6. Or about 2.1 - 2.5 km/L. If I face a strong headwind all day or am doing lots of mountain driving it can dip to 2.0 or 1.9. The wind is what hurts me more than the mountains. I don't drive an aerodynamic truck, I expect an aerodynamic truck MAY increase my fuel mileage by maybe .5 mpg on the average and is not something I am willing to do at this point. The guys claiming they are getting 8+ mpg are likely very light weight, on flat roads and with generally low wind areas.

 

And they have castrated , light spec tractors......

I’m at 100K every load .... 6 mpg max in the summer 4.5 mpg worst in the winter ❄️

 

At 93,500 - yes
I had a s60 12.7 pre emission doing same work as now. Averaged 6 - 7 mpg. 2.5-3.0 km/L. I am convinced the emissions systems are to blame for approximately 1 mpg loss on the average. Saving the planet though.....

 

I was lucky to crack 3.0 km/L with mine. It happened, but was a rarity. One of those things, driving west to east and the wind is behind your back for the most of it.

I have no experience with early cummins engines. Only the latest cm2350.