Hydrogen Hydrogen-Oxygen (HHO) gas is a renewable energy source that is gaining attention as a potential substitute for fossil fuels. HHO can be derived from water (H₂O) through a process called electrolysis using a dry cell HHO generator. This study aims to investigate the impact of adding HHO gas to Pertamax fuel with current variations of 2A, 3A, and 4A on exhaust emissions. The testing in…