Fuel Solutions (FSYS) is doing this in Brazil and Europe. I have a feeling this is going to catch on here in the states as this is the most economical way to rid yourself of gasoline's high prices. It is the best way because the coversion is cheap, and adding a natural gas pump to an already existing gas station is not that hard. FSYS is going to made a PCX like run here and become a $100 stock soon with such a low float and the fast revenue and eps growth they are showing. I just read where Louis Naviller added this company to his Quantum Growth fund which I am surprised because this is really an undiscovered company.