Compressed Natural Gas (CNG) is recognized as an environmentally friendly alternative vehicle fuel, but it has a low flame speed. Combining hydrogen with CNG to create ‘hydrogen compressed natural gas’ (HCNG) allows for faster and leaner combustion. Additionally, with varying cetane numbers, from 63 for to 90 for , serves as a highly reactive fuel suitable for use in a dual fuel strategy known as RCCI (reactivity-controlled compression ignition). This project investigates the impact of adding to HCNG, focusing on pressure, temperature, and emissions. Results indicate that lengthening the OME chain advances the peak heat release rate but delays the second combustion phase. In , the first-phase combustion is 2 °CA shorter than , resulting in a 6.5% higher peak pressure than and a 20% increase over basic diesel. Lengthening the OME chain from to raises the peak pressure by about 6.2%. The addition of gaseous fuels, especially hydrogen, increases peak temperature by 16%. has a similar peak temperature to , while is about 1.5% lower than .

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