Scientists trying to determine which alternative fuel is best for future . Some say compressed natural gas could be the answer . As for cost , the GX natural-gas vehicle is priced at about $ 24,500 , compared to $ 17,000 for a comparably-equipped Civic LX , Ellis said -- except that buyers get a $ 4,000 tax credit on the purchase of the GX . 200,000 Mercedes -powered model sold on the consumer market this year . Only only one CNG refueling stations in U.S , compared to About 1,600 gas stations .
Scientists trying to determine which alternative fuel is best for future . Some say compressed natural gas could be the answer . 200,000 Mercedes -powered model sold on the consumer market this year . Only only one CNG refueling stations in U.S , compared to About 1,600 gas stations .