Improving Heavy Truck Fuel Consumption International Workshop of the Use of Wide Base Tires October 25, 2007 Cheryl L. Bynum U.S.EPA SmartWay Transport Partnership

SmartWay Transport Partnership Background The SmartWay™ Transport Partnership is a collaboration between EPA, industry and other stakeholders, to accelerate deployment of cleaner, more efficient transportation options –Market-based incentives & recognition –Technical tools and information Launched in February, 2004 By 2012 the program aims to save between 3.3 and 6.6 billion gallons of diesel fuel per year which translates to eliminating between million metric tons of CO 2 emissions and up to 200,000 tons of NOx emissions per year

Elements of SmartWay Program 1.Reduce unnecessary long-duration truck and rail idling 2.Establish business-to-business incentives for fuel-efficient transportation through corporate partnerships 3.Identify and promote the most fuel-efficient trucks and equipment 4.Provide access to capital for smaller fleets & owner-operators 5.Disseminate information through events, web site, newsletters, and marketing in mass and trade media 6.Encourage the use of renewable fuels (E85, biodiesel) by providing information, quantifying benefits, and promoting quality-assurance efforts 7.Extend collaboration geographically and throughout the supply chain

SmartWay Program Results 631 partners 671M fewer gallons fuel 7M tons less CO2 30K tons less NOx 824 tons less PM After just 3 years, the SmartWay Program with its many effective strategies for overcoming deployment challenges has achieved the following

Technology Program Goals Demonstrate fuel-saving potential of various heavy-duty truck designs and equipment Explore whether there is an associated reduction in pollutants Designate the cleanest, most fuel-efficient heavy-duty trucks as “SmartWay” Develop test methods, as needed

Our Goal: Reduce emissions while increasing fuel economy

EPA SmartWay tests Phase I ( ) –ROVER PEMS –Mack cooled EGR engine & 2004 emission standards –Single wide tires (2 types), aluminum wheels, trailer aerodynamic fairings (front, side (2 types), rear) Phase II ( ) –SEMTECH-D PEMS and portable fuel tank –Kenworth T600 with 2004 CAT ACERT engine and Freightliner FLD120 with 2000 DDC-60 engine –Single wide tires (2 types), aluminum wheels, trailer aerodynamic fairings (front, side (2 types), rear (2 types))

Test Method SAE J1321 (Joint TMC/SAE Fuel Consumption Test Procedure Type II) –Tests Control (C) and Test (T) truck Compares T:C ratio at baseline and under test conditions Obtains percent change due to component being tested. Both sets of trucks were paired were identical in MY, engine model, drive train components, emission controls, rated HP, engine displacement & manufacturer –Fuel Consumption (gravimetric, J1321) –Fuel Consumption (from carbon balance, J1094a) –NOx Emissions from exhaust gas analyzers –Tested single wide tires with aluminum wheels and aerodynamic fairings (side, front, rear) on trailer –Four different drive cycles –115 total test runs

Drive cycles used in test program

TEST TRACK: 8-mile oval Conducted by SwRI at the Continental General Proving Grounds in Uvalde, TX

Technologies Tested Single wide tires Trailer fairings (composite belly fairing shown)

More fairing types tested: Gap Reducer Aluminum belly fairing Inflatable Boat-tail Folding Boat Tail

Results Results confirmed significant (10% or higher) per-mile reductions in fuel consumption and NOx emissions during highway-type operation –Trailer retrofits account for about 6-7% fuel savings –Single wide tires account for about 3-4% fuel savings –Higher savings from tires may be possible – baseline test tires were lower rr than the most popular brands of line haul drive and trailer truck tires EPA and co-authors (SwRI, Sensors) wrote three SAE papers –Available on EPA SmartWay web site for technical publications: – EPA drafted SIP guidance for States to use fuel-saving truck retrofits to meet air quality standards –Available on EPA web site for SIP and Conformity guidance: – EPA developed a design specification for a “SmartWay” designation for OTR tractor-trailers –Used results of testing, other data and research –To date, all class 8 truck OEs have at least one SmartWay model and 3 major trailer OEs have SmartWay trailers –Tire options include single wides and other low rr tires

Looking Toward Future – Test Method for SmartWay EPA is collaborating with wide range of stakeholders to develop a test method to test medium- and heavy-duty truck fuel consumption –Plan is to offer both a test track and a chassis dynamometer option When test method is finalized, it would be used to designate next generation of SmartWay trucks Plan to have a draft document for external review late this year/early 2008

Looking Toward Future, con’t. EPA would like to be able to offer a modeling option to augment testing –For changing components like tires to a tested truck EPA is closely following the ISO tire rolling resistance standard development –Test could provide a benchmark for determining the tire performance requirement for future SmartWay truck designations and as an input for dynamic vehicle modeling EPA is also closely following current state of research on tire-pavement interaction EPA SmartWay is collaborating with its “sister” programs in Canada and Mexico, to encourage them to consider single wide (and other low rolling resistance) tires in their truck fuel efficiency efforts

Questions? Thank You! Cheryl L. Bynum US EPA SmartWay