Sustainability A variety of features improve sustainability in areas of decreasing waste, extending component life and lowering emissions levels. Sustainability Features The 793F Mining Truck offers continuous rear axle filtration, extended life filters and extended maintenance intervals, which aid in decreasing the amount of waste contributed to our environment. Engines with Advanced Technology Engines with advanced technology contribute fewer emissions to the environment while maintaining fuel efficiency. Advanced Surface Technology (AST) Advanced Surface Technology (AST) is a replacement for hard chrome coatings on some steel parts, including suspension and hoist cylinder rods. This technology improves wear resistance and reduces repair time. Chrome has been eliminated to reduce environmental impact. Fuel Efficiency The engine provides additional retarding by running against compression on downhill hauls. During retarding applications the engine ECM does not inject fuel into the cylinders for exceptional fuel economy. 17