Truck fuel economy expert and manager of sustainability at
Penske, Ralph Stockmayer, told attendees at a recent Penske forum its new Selective
Catalytic Reduction (SCR) equipped trucks provided large fuel
savings compared to 2007 models.
According to reports from FleetOwner's blog, the comparison saw 2010
models gain an 11.3% in fuel efficiency compared to 2007 models.
Tests were run with 2007 Detroit Diesel Series 60 engines and the
company's new 2010 DD-13 models. Both engines were rated at 455
horsepower, pulling 80,000-pound rigs in the Midwest.
However, Stockmayer added that 2% needed to be deducted to
account for the amount of Diesel Exhaust Fluid (DEF) which the new
trucks use, and that a similar comparison has not been possible
with models which use Exhaust Gas Recirculation (EGR) because they
had not been on the market long enough.