The Home refueling stations are too expensive to realize any benefit IMHO. you would have to drive an insane amount in order for it to acutally cover any cost. If there was a supply of CNG locally that you could use then i'd say look into retrofitting your car because there are some awesome kits available and if you have any technical skills you can do it your self. If not then try to find the most economical gas guzler you can. Best of luck and hope something works out for you.
CNG Conversion Kits Info