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Government Study Finds Skirts and Tails the Most Fuel-Efficient Trailer Devices

LONGVIEW, Texas (October 14, 2015) ­– A recently released study from the National Resource Council of Canada determined that the combined use of a rear fairing and trailer skirt provides a 10 percent increase in aerodynamic efficiency above the sum of the individual products.

The extensive review, conducted from 2012 to 2015, used products comparable to the STEMCO TrailerTail® and EcoSkirt™ in a 30 percent scale wind tunnel to evaluate the benefits attainable by a variety of commercial trucking aerodynamic devices.

A key finding of the study revealed that “side-skirts and boat-tails provide the greatest drag reductions” among the devices studied. The findings, which confirm proprietary STEMCO research, determined that users can save nearly 1,400 gallons (5,300 liters) of fuel per truck, per year by using both a rear fairing and side skirt.

"In our study, we were excited to see that adding skirts and tails were actually mutually beneficial at multiple yaw angles" said Brian McAuliffe, senior research officer at the National Research Council of Canada. "We hope our study will help North American trucking fleets become more fuel efficient and better understand the aerodynamic benefits of current and future technologies"

Over 40,000 TrailerTail® units, operated by more than 500 fleets, are currently in use on North American highways, saving more than 20 million gallons of diesel fuel annually.

The independent NRC test also confirmed research completed by STEMCO which indicated that a 4-sided, 4-foot-long TrailerTail® 4x4 delivers slightly more drag reduction than the 3-sided, 3-foot-long TrailerTail® Trident. However, combined with Eco-SkirtTM, both TrailerTail® 4x4 and TrailerTail® Trident models meet the Environmental Protection Agency’s proposed GHG Phase 2 regulations.

"The NRC study further validates that a TrailerTail® and EcoSkirt™ should be essential elements in modern fleet operations" says Al Smith, Director of Sales for STEMCO Innovative Tire & Mileage Solutions group. "Companies could be losing over a thousand dollars in fuel costs per trailer per year by only using one or the other.

STEMCO TrailerTail® products are also available with a patented AutoDeploy™ feature that further optimizes their fuel efficiency by automatically activating when a truck reaches 35 miles per hour.

With a typical return on investment of under two years, TrailerTail® products have saved the trucking industry over $100 million dollars in fuel to date.



With offices and manufacturing facilities in Texas, Georgia, Michigan, Kentucky, Tennessee, Ohio, California, Canada, China, Australia and Mexico, STEMCO is a leader in the technology and manufacture of commercial vehicle wheel end, braking and suspension components, as well as innovative tire & mileage solutions. STEMCO is an EnPro Industries, Inc. (NYSE: NPO) company. EnPro is a leader in the manufacture of sealing technologies and engineered products for use in critical applications by industries worldwide. For more information, visit the STEMCO website at

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