EFI with E-Gov and patented RED Technology takes Exmark mowers to a new level. Electronic Fuel Injection with electronic governor and Exmark's exclusive, patented RED on-board intelligence platform debut on 2013 Lazer X-Series mowers powered by Kohler EFI engines. Mechanical governors use a spring that's slow to respond to engine loads. To compensate, operators typically run engines at high RPM to maintain blade speed regardless of load, which increases fuel consumption and engine wear. EFI with E-Gov basically eliminates governor droop, maintaining engine RPM and blade speed under varying conditions. This improves fuel efficiency up to 25% without reducing cut quality.