Green Bay based Schneider National has announced plans to expand its fuel conservation efforts by slowing down its fleet to 60 mph. A company news release claims the voluntary effort will reduce the fleet's consumption of diesel fuel by more than 3.75 million gallons a year and reduce truck CO2 emissions by 83.25 million pounds a year — the equivalent of taking 7,259 cars off the nation's highways. The slowdown was announced during a news conference Thursday in Washington, D.C., as the American Trucking Associations unveiled its strategies for minimizing the carbon footprint of the trucking industry. Schneider is the nation's largest truckload carrier, with more than 21,000 employees worldwide.