India is likely to introduce a mandate for blending isobutanol with diesel as early as this year, a move that could have a bigger impact on the country’s energy security than ethanol blending in petrol given diesel consumption is nearly twice that of petrol, said Road transport and highways secretary V Umashankar. Speaking at the CII Multimodal Transportation and Logistics Summit in New Delhi on Friday, Umashankar said the government was examining diesel blending with “great seriousness” and early results from ongoing trials were encouraging.