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According to FedEx, its hybrid delivery vehicles have saved approximately 83,000 gallons of fuel and eliminated 950 tons of greenhouse gas emissions while racking up an impressive 2 million miles overall. Because of this success, the global delivery giant will be adding 75 new hybrid vehicles to its fleet, making for a total of 172 hybrid vehicles. The hybrid trucks used by FedEx are said to improve fuel economy by 42 percent, reduce greenhouse gas emissions by approximately 30 percent and cut particulate pollution by 96 percent.

FedEx uses hybrid technology from Eaton, Isuzu, Iveco and Azure Dynamics with Ford engines and chassis. That's a lot of different systems for one company. Mitch Jackson, director of Environmental Affairs and Sustainability at FedEx, calls for "truck manufacturing industry to create its version of the Prius: clean, affordable and widely available for truck fleets."

FedEx also plans to test Class 6 vehicles using hybrid hydraulic technology from Parker Hannifin Corporation and replace some of their air fleet with more efficient Boeing 757 planes. All of these changes will result in less fuel consumption, helping FedEx's bottom line and, more importantly, reduce harmful emissions.