WARRENVILLE, Ill. — Navistar Inc. said Monday that “fluid efficiency” and not “fuel efficiency” should be the correct term when comparing 2010 engine technology and that its ProStar+ and MaxxForce 13 EGR (Exhaust Gas Recirculation) 2010 engine beat competitors in third-party, on-road testing.
Navistar commissioned the Transportation Research Center Inc. to conduct a “fluid economy comparison” testing the ProStar+ with a Freightliner Cascadia with a Detroit Diesel DD15 engine and a Kenworth T660 with a Cummins ISX15, both using liquid urea and SCR (Selective Catalytic Reduction).
Each ran a 444-mile run around Northern Indiana on a four-lane public highway to represent truckers’ daily routes.
Navistar spokesmen said the ProStar+ “outperformed” its competitors by “nearly 1 percent to 2.5 percent.”
In response to reporters’ questions during a webinar on the findings Monday, Navistar spokesmen said comparing the MaxxForce 13 and the 15-liter engines by the competition was not comparing apples and oranges because competitors saw the trucks used in the competition as the most fuel efficient they had to offer. Also, the Freightliner and Kenworth trucks used in the competition were purchased by Navistar when only the 15-liter engines were available, said spokesmen.
Navistar also noted that the launch of its own 15-liter engine, the Maxxforce 15, “remains on track for October with a full-scale launch in January 2011.” They said it will be tested competitively as well.
“Until recently,” said Jim Hebe, Navistar senior vice president, North American sales operations, “comparisons of Class 8 trucks were centered on fuel economy … However today, with different trucks offering different technologies for 2010 emissions, fuel economy doesn’t tell the whole story. Competitors’ trucks offer a liquid urea SCR solution and like diesel fuel, liquid urea costs money.”
The testing was independent Truck Maintenance Council Type IV testing and drivers and trailers were switched at the mid-pint of each test.
As to why the tests were done on the highway and not on a closed track, Navistar spokesmen said they wanted the tests to mirror true driving conditions as much as possible.
Axle ratios were picked for the competition based on dealer recommendations and the trucks had a gross combination weight of 80,000 pounds.
Navistar said the ProStar+ with MaxxForce 13 offers a weight advantage over 15-liter engines while maintaining the power customers need.
Dorothy Cox of The Trucker staff may be contacted to comment at email@example.com.