Big rig questions

[Magard]

Late 90’s early 2000. Maybe up to 2004 or so then they put egr. This motor is like a 11 liter 5.9 Cummins with a real Jake break. You could literally get 10-11 mpg pulling a rv if you not going to fast. I had one with a 450hp fire truck program in it that I got 12 mpg pulling a small 3000 gallon tank trailer loaded one way empty back. It got good enough fuel mileage that when I put a driver in it and I drove my truck with 15 liter Detroit s60. The fuel difference doing the same work running together the ism fuel savings paid the drivers wages. That’s what emissions did for us.