From a 2013 article, may not be currently accurate!!!
Raider Express started limiting the speed of its trucks in 2005, starting at 68 mph and gradually dropping it to an industry low of 60 mph. Component specs are designed to maximize mpg in the 57- to 68-mph range. It’s been an early adopter of technologies such as wide-base single tires, lightweight components and automated manual transmissions. Monthly truck averages regularly run above 9 mpg, sometimes above 10, while averaging 77,000 pounds GVW. Its 175 tractors are predominantly clean 2012 or newer tractors or experimental CNG trucks. The 300 refrigerated trailers are equipped with TrailerTails and side skirts. Raider says it has a “culture of fuel economy.