The document discusses lightweighting in the transportation industry to increase fuel efficiency and reduce emissions. Lightweighting uses advanced materials and technology to lower the weight of vehicles, providing a 1-2% increase in fuel efficiency for every 100 pounds removed. A case study found that reducing the weight of 184 trucks by lightweighting strategies increased their fuel economy from 8 to 10 miles per gallon, saving over 1.3 million gallons of gas and 12,975 tons of CO2 emissions over the fleet's lifetime.