OEMs are focused on efficiency

Of course fleet owners and managers play a big role in the fuel efficiency of their operations. The way they spec a vehicle, the add-on devices they select, the way they train drivers all can increase the number of miles a truck gets out of a gallon of diesel.
But the design of the truck itself and the options offered by the truck makers also are key to just how efficient a truck can be.
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Source:: http://fleetowner.com/fleet-management/oems-are-focused-efficiency