In a move towards smaller engines with more power, medium-duty truck engine makers have turned their attention back to improving fuel economy after more than a decade of focusing on controlling emissions. Isuzu Commercial Truck of America and Mitsubishi Fuso are two manufacturers who said their new trucks will get up to 20% better fuel mileage than their predecessors due to new fuel-economical engines. Truck buyers will find the engine technologies added to meet emissions standards over the past decade will make it easier to meet the new 2014 standards for fuel efficiency and greenhouse gases.