International Truck unveiled a new fuel efficiency package for its ProStar model, called ProStar ES. Short for efficiency specification, the ES package combines enhanced aerodynamics with improved powertrain efficiency and Navistar’s proprietary OnCommand Connection remote diagnostics system.

“The ProStar ES is a package, an ecosystem, if you will, developed by our performance engineering team to deliver maximum fuel economy,” says Jodi Presswood, vice president of the Navistar Heavy-duty Truck Product Line.

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