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International on Friday introduced its new flagship line of Class 8 on-highway trucks, taking the mantle from the company’s ProStar. International says its LT Series, the company’s most fuel efficient line of trucks to date, was designed with feedback from drivers that resulted in a final product that Jeff Sass, senior vice president of sales and marketing for Navistar, calls “the most driver-centric Class 8 vehicle we’ve ever built.” The truck…