What are the hours of work? http://losamigoshogar.com.ar/missourihealthconnectionorg-c602.pdf medicalsuppliesnearme.com  There are now only about 66,000 light-duty natural gas-powered cars on U.S. roads, according to the Department of Energy, which tracks vehicles fired by alternative fuels. That is a tiny fraction of the nearly 200 million light-duty vehicles on U.S. roads, according to the Transportation Department.