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ROUSH CleanTech became the first propane provider to obtain the ultra-low NOx certification of 0.02 g brake/ horsepower per hour, which is about 90 percent below federal standards, for Blue Bird. (In May, the firm joined Cummins Westport in meeting the same certification level for CNG engines.) Many districts that have selected propane gas as their fuel have positive results. “Propane buses have proven to be a financially viable


option for the Bibb County School District,” said Anthony Jackson, transportation director for Bibb County Schools in Macon, Georgia. “The infrastructure for refueling bus- es across the nation is already in place.” Jackson added that the district has yet to replace any of its


fuel. “By far, we have found that propane has the best total ownership cost when comparing all fuel types,” said Szczypiorski. “The infrastructure is inexpensive—or even free when a fuel contract is signed—and the bus essentially pays for itself over a short time with fuel and maintenance cost savings. Emissions are very low with our ultra-low NOx engine.”


propane engines, but noted that if it had to, the cost would still be significantly lower than replacing a diesel engine. He also said driver feedback on propane has been pos-


itive. “Our drivers love them,” he added. “They appreciate not having to deal with the exhaust smell of the diesel engine, and that there is less engine noise. So they don’t have to contend with loud engines while driving and managing student behaviors. They find the performance of the propane buses to be more than adequate.”


Move to Zero


The Cummins Westport B6.7N features next generation natural gas engine technology and a 50% reduction in NOx emissions compared to current EPA standards. Rated up to 240 hp with 560 lb-ft torque and maintenance-free aftertreatment, it offers reliability, durability, and low emissions.


The B6.7N is available today for your school bus fl eet.


Learn more:


cumminswestport.com cwiplaybook.com


50 School Transportation News • JULY 2019


PROPANE EDUCATION & RESEARCH COUNCIL


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