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  • TrailerTail is a rear-drag reduction device for tractor trailers. The device works by streamlining the air on the back of a semi-trailer. Independent SAE J1321 tests have shown the device to save over 6.58% fuel at 65 mph. TrailerTail is now part of Navistar's SuperTruck project, which will use $37 million of US Department of Energy grants to build the next generation truck and tractor trailer. TrailerTail is manufactured by ATDynamics, Inc. headquartered in Silicon Valley, California.