`` Now , it 's just a matter of society continuing to change , and to continue to become more environmentally-minded . Scientists trying to determine which alternative fuel is best for future . Comment: Only only one CNG-powered model sold on the consumer market today . About 1,600 CNG refueling stations in U.S , compared to 200,000 gas stations .
Scientists trying to determine which alternative fuel is best for future . Comment: Only only one CNG-powered model sold on the consumer market today . About 1,600 CNG refueling stations in U.S , compared to 200,000 gas stations .