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Independent testing finds Thomas Built Buses with SCR delivers better fuel economy than equivalent EGR system

A recent, independent, third-party test of a Thomas Built Buses Saf-T-Liner C2 against an IC Bus™ CE Series found that the SCR technology in the Thomas Bus delivers 7-27% better fuel economy than the EGR technology in the IC bus and, when factoring in the cost of diesel exhaust fluid (DEF), is the more cost-effective choice. Industry-recognized methodology, SAE J1526, Type III, was used for calculating fuel consumption differences between vehicles. The test was commissioned by Thomas Built Buses.

Thomas Built Buses commissioned the fuel economy evaluation of a Thomas Built Buses Saf-T-Liner C2, powered by a Cummins ISB 6.7 liter engine, and an IC Bus CE Series, powered by a MaxxForce DT 7.6-liter engine. Both engines were 2010 diesel emissions compliant. The Thomas Built bus was equipped with selective catalytic reduction (SCR) technology and the IC bus was equipped with in-cylinder exhaust gas recirculation (EGR) technology.

The test results, provided by Bosch Automotive Proving Grounds in December 2011, showed that the Thomas Built C2 delivered a fuel economy advantage over the IC CE Series, regardless of the route (urban or highway) and transmission mode (Economy or Performance). The fuel economy advantage, after factoring in the cost of DEF, can add up to an annual operating cost savings of $603 to $1,417 per bus.

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