For as long as can be remembered, getting a tractor-trailer to attain 10 mpg represented the Holy Grail of efficiency for the trucking industry. It was a magic number targeted by everyone from government scientists and private sector engineers to drivers and fleets alike. And for just as long, breaking that mythical 10 mpg barrier proved to be difficult if not impossible, in no small part due to the complex emissions control systems added to diesel-fired commercial vehicles since 2002. ...

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