What is typical fuel mileage for diesel semi tractor-trailer rigs on the highway?

Typical fuel mileage for diesel semi tractor-trailer rigs on the highway can vary depending on a number of factors, including the weight of the load, the type of engine and transmission, and the driving habits of the driver. However, a typical range for fuel mileage is between 6 and 8 miles per gallon (mpg) on the highway.

To improve fuel mileage, drivers can use a number of techniques, including:

- Using cruise control to maintain a steady speed.

- Avoiding excessive idling.

- Minimizing the use of air conditioning.

- Shifting into higher gears as soon as possible.

- Avoiding rapid acceleration and deceleration.

By following these tips, drivers can help to improve the fuel mileage of their diesel semi tractor-trailer rigs and save money on fuel costs.