By replacing the carburetor with electronic fuel injection (EFI), Miller Electric Mfg. Co. has managed to cut hydrocarbon and nitrogen oxide emissions by 33 and 27 percent respectively on each of two updated welder generator models, the manufacturer says. The Trailblazer 302 EFI and Bobcat 250 EFI are the only EFI engine-driven, twin-cylinder welder generators available in the industry, says Miller, improving claimed fuel economy up to 27 percent.