v6 or 4 cylinders
how many miles they make for a gallon of diesel ? JUST THE TRUCK ,WITH NO TRAILLER|||One popular engine in a Peterbilt is the Caterpillar C-15.
It is an in line 6 cylinder, 15 liter (a Mustang V-8 is 5 liter) Diesel, that develops 400 - 600 horsepower.
For mileage I'd guess about 4.5 to 5.5 MPG. It depends on the options in the truck and the driver.