Ultimate Test Drives… Detroit Diesel DT12 Test Drive Pt 3: An Easy Walk Up a Big Hill

In the afternoon portion of his day-long test drive of a Detroit DT12 equipped Cascadia, Jim spent a few hours running up and down Hunter Hill on I-80 to see how the transmission’s two modes – performance and economy – differed (if at all) in how they handled the hill’s steep 6% grade.


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