Homogeneous charge compression ignition (HCCI) is a promising alternative combustion mode to conventional diesel combustion to achieve better engine performance and lower particulate matter and oxides of nitrogen emissions. A major obstacle for commercial implementation of HCCI combustion mode is a narrow operating load range. Several thermal and fuel management strategies have been investigated so far to address the shortcomings of HCCI, among which fuel management strategies are generally more effective. The present study intends to utilize high volatile, optimum reactivity fuels (such as diisopropyl ether, isobutanol, and ethanol) to extend the operating load range of a light-duty diesel engine operated in HCCI mode.