There's a lot of clamor about using natural gas to fuel trucking fleets in the United States, and now it looks as if several retail and consumer-goods companies want it to happen. Some companies, including UPS (NYSE:UPS), are quick to catch on, and others aren't far behind. While natural gas might not be the perfect solution for every part of the country, fleet vehicles in certain parts of the country could benefit greatly from the $1.50 discount per gallon equivalent that natural gas has over diesel. 

Fleet vehicles and trucking have been in the sights of natural gas for quite some time, and several companies are tailoring their business to spur the evolution. In this video, Fool.com contributor Tyler Crowe talks with Aimee Duffy about what makes fleet vehicles the best candidates for natural gas and who stands to benefit from expanded natural gas use. 

Fool contributor Aimee Duffy has no position in any stocks mentioned. Fool contributor Tyler Crowe owns shares of Westport Innovations. You can follow them both on Twitter, @TMFDuffy and @TylerCroweFool, respectively. 

The Motley Fool recommends Clean Energy Fuels, Cummins, FedEx, Nike, Procter & Gamble, UPS, and Westport Innovations and owns shares of Cummins, General Electric, Nike, and Westport Innovations. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.