An exhaustive review of 10 different data sets in a new report issued by the North American Council for Freight Efficiency (NACFE) this week finds that a 6x2 axle configuration can on average improve Class 8 sleeper tractor fuel economy by 2.5% versus a traditional 6x4 setup, with a 20 month payback period required to offset the higher initial cost of the 6x2 package. “We have medium to high confidence in these findings due to all the testing,” Mike Roeth, NACFE’s executive ...

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