There are also outstanding questions related to the real - world efficiency gains of natural gas fuels and the life - cycle emissions they produce based on methane leakage in the production process. (scientificamerican.com)
The long - term opportunity comes from supplying stations with natural gas fuels each and every year. (fool.com)
«Giant Eagle Inc. held a press briefing this morning to show off its first two compressed natural gas fueling stations in the region. (autoline.tv)