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Kenn · 08-22-2016, 11:25 AM

Don you do go a long way on a gallon of fuel. My rig is much older and smaller. 1982 Peterbilt 359 with a 450 hp Cummins STC (step timing control). The engine is a 1987. I have a 13 speed manual transmission with 336 rear end. I am 30' long and weigh just under 25 K loaded and tow a trailer 7K or Scion XB 2600 lbs. 1500 rpm in 8 th direct gives me 60 mph. My best has been 9.7 and worst 7.8 with an average around 8.8. I am sure that my big square bunk above the cab has bad aero drag and in a head wind I use more fuel. I try to end each trip with a fuel-up at the same fuel pump thinking that I would be more accurate with my fuel use. I don't have a gauge that shows real time fuel use so I run the engine where it feels like it is in a sweet spot.

08-22-2016, 11:25 AM	#3
Kenn Senior Member Join Date: Sep 2010 Location: Willamina Or Posts: 277	fuel consumption Don you do go a long way on a gallon of fuel. My rig is much older and smaller. 1982 Peterbilt 359 with a 450 hp Cummins STC (step timing control). The engine is a 1987. I have a 13 speed manual transmission with 336 rear end. I am 30' long and weigh just under 25 K loaded and tow a trailer 7K or Scion XB 2600 lbs. 1500 rpm in 8 th direct gives me 60 mph. My best has been 9.7 and worst 7.8 with an average around 8.8. I am sure that my big square bunk above the cab has bad aero drag and in a head wind I use more fuel. I try to end each trip with a fuel-up at the same fuel pump thinking that I would be more accurate with my fuel use. I don't have a gauge that shows real time fuel use so I run the engine where it feels like it is in a sweet spot.