This document provides an overview of natural gas as a vehicle fuel, fueling options for natural gas vehicles, and factors to consider when purchasing or converting a vehicle to run on natural gas. It discusses the benefits of natural gas including cost savings, domestic supply, reduced emissions, and lower carbon footprint compared to gasoline or diesel. The document outlines the different types of natural gas fueling options including time-fill, fast-fill, and combo-fill. It also provides questions fleet managers should consider when evaluating their fueling needs and options. Finally, the document discusses the process of switching a fleet to natural gas and getting started with planning and evaluation.