A key design focus for the ISG12 engine has been to achieve significant weight savings in order to increase the power-to-weight ratio. The ISG12 engine incorporates the newly developed Cummins Xtra-High Pressure Injection (XPI) fuel system, enabling quicker power response. It is the ideal power solution for heavy-duty trucks in long-haul and regional transportation, and vocational services, as well as buses and coaches.