Navistar touts ‘fluid economy’ of International ProStar+

user-gravatar Headshot

Navistar this week announced that a third-party test it commissioned shows the 2010 International ProStar+ with MaxxForce 13 Advanced EGR engine leads all Class 8 trucks in “fluid economy” – a measurement of diesel fuel plus liquid urea consumed.

Traditional comparisons of Class 8 trucks center on fuel economy. But Navistar officials claim that today, with different trucks offering different technologies for 2010 emissions, fuel economy calculations alone don’t give fleets an accurate accounting of fluids consumed during vehicle operations. Navistar is the lone manufacturer using exhaust gas recirculation technology combined with U.S. Environmental Protection Agency emissions “credits” (granted for early compliance with 2007 emissions guidelines) to meet EPA 2010 emissions requirements. All other diesel engine manufacturers in North American use Diesel Exhaust Fluid (liquid urea) which sprays hot diesel exhaust in a selective catalytic convertor to dramatically reduce emissions of nitrous oxide in compliance with EPA 2010 diesel exhaust requirements.

Navistar commissioned the Transportation Research Center Inc. in East Liberty, Ohio, to conduct a head-to-head fluid economy comparison. TRC performed independent Technology & Maintenance Council Type 4 testing of three EPA 2010-compliant trucks: International ProStar+, Freightliner Cascadia powered by the Detroit DD15 engine and a Kenworth T660 powered by a 15-liter Cummins ISX, both with liquid-urea SCR.

The engines were rated with comparable horsepower and torque. Navistar executives chose versions of their competitors’ trucks that dealers noted as the most fuel-efficient powertrain packages available.
Only one tank of diesel per truck was allowed, and each ran three 444-mile routes on public highways. Drivers and trailers were switched at the mid-point of each test.

Navistar’s says the testing showed its International ProStar+ consistently outperformed competing trucks by nearly 1 to 2.5 percent in efficiency measuring diesel and urea, which is used in selective catalytic reduction technology employed by other truck engine manufacturers.

Partner Insights
Information to advance your business from industry suppliers

“With the ProStar+, we continue to have the most efficient Class 8 truck on the road,” says Jim Hebe, Navistar senior vice president for North American sales operations.
For more information on the testing and results, go to