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The regulatory drive for emission reductions, increased fuel costs, and likely increases in Corporate Average Fuel Economy (CAFE) requirements have made fuel efficiency a key issue for North American vehicle manufacturers and marketers. At the same time the popularity of sport utility vehicles and light trucks has made it more difficult to achieve CAFE objectives. In order to accommodate both public vehicle preference and government mandated CAFE requirements automobile manufacturers are seeking all available means to increase fuel economy through advanced system design, engineered materials, and improved lubricant technology. Axle lubricants can have a significant impact on fuel economy; moreover, axle lubricants can be tailored to deliver maximum operating efficiency over either specific or wide ranges of operating conditions.