Basically, there are two ways to refuel a CNG vehicle, Time-Fill and Fast-Fill.

Time-Fill

Refuel at home with the convenience of the Phill appliance from FuelMaker. The Phill vehicle refueling appliance installs in your garage and allows you to refuel overnight at the rate of about one gallon (GGE) per hour.  Filling up at home costs about $1.00 a gallon (GGE) or less in most locations.  Larger Time-Fill systems are also available for fleet refueling needs.  Combination Time-Fill and Fast-Fill systems are also available.

Fast-Fill

Fast-Fill fueling stations work just like regular gas stations.  You pull up to the dispenser, swipe your credit card and connect the hose.  The time required is about the same as refueling with gasoline.

Currently, there is only one public fueling station in Austin, although there are 18 others state-wide.  It is located at 2514 Business Center Drive in Austin and is operated by the City of Austin to fuel their vehicles, but it is also open to the public.  CleanFuel Conversions is also looking at the possibility of opening a few more stations around Austin in the near future.