Miller® Bobcat™ 250 EFI (Kohler) The Miller Bobcat 250 gas welder with EFI AC/DC Engine Drive Welder (Kohler) With EFI features Electronic Fuel Injection. Similar to the technology found in cars, EFI optimizes the air/fuel ratio for better performance and greater efficiency. https://weldersdepots.com/product/miller-bobcat-250-with-efi-ac-dc-engine-drive-welder-kohler-with-efi-907502/