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Premixed compression ignition (PCI) strategies offer the potential for simultaneously low NOx and soot emissions and diesel-like efficiency. However, these strategies are generally confined to low loads due to difficulties controlling the combustion phasing and heat release rate. Recent experiments have demonstrated that dual-fuel reactivity-controlled compression ignition (RCCI) combustion can improve PCI combustion control and expand the PCI load range. Previous studies have explored RCCI operation using port-fuel injection (PFI) of gasoline and direct-injection (DI) of diesel fuel. In this study, experiments are performed using a light-duty, single-cylinder research engine to investigate RCCI combustion using a single fuel with the addition of a cetane improver 2-ethylhexyl nitrate (EHN). The fuel delivery strategy consists of port-fuel injection of E10 (i.e., 10% ethanol in gasoline) and direct-injection of E10 mixed with 3% EHN.