A growing number of fleets are testing or making large-scale deployments of natural gas powered vehicles. Here's a sampling, including a slide show of some of these fleets and others:

SLIDE SHOW: FedEx Freight is one of many companies trying out natural gas fuel. <A HREF=
SLIDE SHOW: FedEx Freight is one of many companies trying out natural gas fuel.
click here" />

FedEx Freight Testing LNG Tractors in Dallas
FedEx Freight has begun beta testing two new tractors powered by Cummins Westport ISX12 G liquefied natural gas-only engines.

Talon Logistics and CNG
A Q&A with Talon Logistics, the private fleet of food and fuel retailer Giant Eagle, which is not only selling natural gas retail, but also operating CNG-powered Class 8 trucks.

2012 Truck Fleet Innovators: Bill Malone -- Investing in alternative fuels
For Bill Malone, president of Enviro Express, trucking was a way to fulfill his goal of being an entrepreneur. Natural gas is where this entrepreneur saw yet another business opportunity. Not only is he buying natural-gas-powered trucks, but he's also opened the first liquefied natural gas fueling facility east of the Mississippi River.

Kwik Trip Advocates Natural Gas Adoption
Kwik Trip, a convenience store and fuel chain with more than 400 locations in three states, is promoting liquefied and compressed natural gas, and uses the fuel in its own fleet.

Florida 3PL Adding Natural-Gas Trucks to For-Hire Fleet
Saddle Creek Corp., a nationwide third-party logistics provider based in Lakeland, Fla., is taking delivery of the first 40 natural gas trucks in a planned purchase of 120.

Public-Private Partnership Helps Put Natural Gas Trucks into Southern California Fleets
What do an office supply store, a dairy processor, a flooring supplier, a beer distributor and a grocery retailer have in common? Of course they all use trucks, but the latest, leased from Ryder System, are powered by natural gas.

Dairy Operation to Recycle Natural Waste of Cows into Fuel for Delivery Vehicles
Recycling waste is an integral part of sustainable living in both small-scale homes and large-scale industrial operations. Fair Oaks Farms, a dairy farm in northwestern Indiana, is taking this concept to a new level. They are implementing a plan to use cow manure to fuel the very trucks that deliver milk to processing plants throughout the Midwest.

VIDEO: Charley Gregory, Vice President and COO of Royal Disposal and Recycling. In an effort to save money and be environmentally conscious, his company has made the switch to natural gas-powered refuse trucks.