- Karnataka has claimed that tests on petrol samples in the state revealed ethanol blending levels touching up to 31%, significantly higher than the mandated 20% (E20) target. - Higher-than-authorized ethanol blending (such as E31) poses risks to older internal combustion engine (ICE) vehicles that are not optimized or calibrated for high-ethanol fuel mixtures, potentially causing engine damage and corrosion. - The findings raise regulatory and quality-control concerns regarding fuel supply chains, oil marketing companies, and compliance with the National Policy on Biofuels. - Unregulated high blending can also impact fuel efficiency, vehicle performance, and consumer rights if motorists are unaware of the actual composition of the fuel they purchase. - **Ethanol Blending Programme:** An Indian government initiative aimed at reducing crude oil imports and carbon emissions by mixing ethanol with petrol, scaling up toward the national E20 blending target. - **E20 Petrol Initiative:** A fuel standard designating petrol blended with 20 percent ethanol, introduced to curb fossil fuel dependence and lower vehicular exhaust emissions. **Introduction** Karnataka has flagged that ethanol blending in petrol samples within the state has reached up to 31%, well above the national E20 (20%) target. This disclosure brings to light critical issues regarding vehicle engine compatibility, regulatory oversight of oil marketing companies, fuel efficiency impacts, and supply chain compliance under India's biofuel mandate. **Core Issue and Detailed Points** - Karnataka has claimed that tests on petrol samples in the state revealed ethanol blending levels touching up to 31%, significantly higher than the mandated 20% (E20) target. - Higher-than-authorized ethanol blending (such as E31) poses risks to older internal combustion engine (ICE) vehicles that are not optimized or calibrated for high-ethanol fuel mixtures, potentially causing engine damage and corrosion. - The findings raise regulatory and quality-control concerns regarding fuel supply chains, oil marketing companies, and compliance with the National Policy on Biofuels. - Unregulated high blending can also impact fuel efficiency, vehicle performance, and consumer rights if motorists are unaware of the actual composition of the fuel they purchase. **Key Statutory Bodies, Acts & Concepts** - **Ethanol Blending Programme:** An Indian government initiative aimed at reducing crude oil imports and carbon emissions by mixing ethanol with petrol, scaling up toward the national E20 blending target. - **E20 Petrol Initiative:** A fuel standard designating petrol blended with 20 percent ethanol, introduced to curb fossil fuel dependence and lower vehicular exhaust emissions.