Information on The List was obtained from each individual organization through surveys and published sources and could not be independently verified. Although every attempt is made to ensure the accuracy and thoroughness of The Lists, omissions sometimes occur. In case of ties, companies are listed alphabetically. Local and Memphis area refers to Shelby, Tipton, and Fayette counties in Tenn.; DeSoto, Marshall, Tate, and Tunica counties in Miss. and Crittenden County, Ark.
The system, known as NeuFuel, differs from compressed natural gas because it can be used at a lower pressure than CNG.