Green Technology - SCR - Simple, Cost-effective, Ready

No matter what your role in transportation, SCR is a simple, cost-effective and ready NOx reduction technology that delivers engine reliability, increases fuel economy and requires fewer regenerations.

It's Simple: Because of the many benefits SCR technology offers purchasers, drivers and technicians, SCR is the clear choice for meeting EPA 2010 emission standards.

Purchaser Benefits	Driver Benefits	Technician Benefits
Offers 5-9% fuel economy advantage vs. In-cylinder EGR technology Saves fuel for every eliminated regeneration Maintains all the options you expect, from A/C condensers and roomy luggage compartments to wheelchair lifts Tested by millions of miles and years of experience worldwide Trusted by nearly all of the world's leading engine manufacturing companies CO2 emissions decrease as fuel economy improves	Maintains daily ease of use. Requires only a glance at the dash-mounted diesel exhaust fluid (DEF) gauge. Low-level warning is as easy as reading a fuel gauge Yellow gauge warning indicates approximately 450 miles to go Preserves passenger safety. Engine will not shut down if DEF tank is empty. Allows adherence to schedule. Empty tank will not cause the bus to shut down while driving. Five mph de-rate only occurs after bus has been turned off and restarted. Full power will resume after DEF tank is filled. Eliminates driver fill ups. DEF tank fill intervals allow for fill at regular technician servicing.	Provides a reliable and durable technology Offers greater component reliability due to less EGR, higher oxygen levels, less heat rejection and fewer changes to moving engine parts No complex changes to the engine DEF filter replacement required approximately every 200,000 miles/6,500 hours DEF refill will be approximately 4 fills per year Uses DEF, a safe solution that is less toxic than other shop fluids such as windshield washer and antifreeze

It's Cost-effective: With a reliable and proven engine architecture, SCR is the only clean-air technology that actually pays you back over the life of your bus.

Cummins Inc. conducted testing of both SCR and In-cylinder EGR systems and determined that SCR technology is better for customers because of the following:

• In-cylinder EGR reduces engine life by 20-25%
• SCR has greater component reliability
• SCR technology achieves a 5-9% fuel economy advantage over In-cylinder EGR

A 9% increase in fuel efficiency saves $265 per bus per year (based on assumptions below)
School Bus Usage Assumptions Average yearly mileage: 14,500 miles Fuel economy (with DEF): 8.5 mpg Local diesel price: $2.22 Yearly diesel usage: 1,700 gallons Yearly diesel expenditure: $3,774	DEF Consumption Assumptions Percentage of DEF to diesel usage: 2% Number of DEF fills (11-gallon tank): 3.10 Number of DEF fills (13-gallon tank): 2.62 Yearly DEF usage: 34 gallons DEF price target: $2.61 Yearly DEF expenditure: $89

It's Ready: Thomas Built's SCR emission technology is ready. SCR is the mainstream technology that manufacturers of 90 percent of North American on-highway engines will use to meet 2010 emission standards: Daimler Trucks, Cummins, Detroit Diesel, GM, Isuzu, Volvo, Paccar, Hino and Mack. And in the consumer car industry, BlueTec is becoming the SCR technology of choice. Currently, SCR systems can be found in Mercedes-Benz, Audi, BMW, Jeep, Kia, Mini, Volkswagen and Hyundai.

Since 1978, many different exhaust systems in Europe have incorporated SCR technology. SCR has emerged as the best EPA 2010 technology based on environmental advantages and payback. SCR is proven to reach the EPA 2010 NOx requirement of 0.2/bhp-hr. Add to that the reliable engine architecture you know and trust.

The technology backed by millions of miles. Daimler Trucks alone logged more than 12 million SCR testing miles in North America. More than 600,000 SCR vehicles operate in Europe, from Scandinavia to the Mediterranean, and more than 245,000 of them are Daimler and/or Cummins SCR vehicles.