CNGas, which specializes in retail CNG fueling stations and bi-fuel vehicle conversions, and Nopetro, a  natural gas fueling infrastructure provider, have signed an agreement to open a public compressed natural gas fueling station in Miami-Dade County in Florida.   The 30,000-sq.-ft. fast-fill facility  can support the fueling needs of up to four vehicles at a time, the company said. Nopetro will support CNGas by contributing its CNG fuel marketing and operational ...