India’s E100 ethanol ambitions could trigger ₹37,000-50,000 crore of industry spending even as mobility experts expect flex-fuel vehicles to account for only a low single-digit share of the market by 2030. Industry estimates suggest the bill could include ₹22,000-30,000 crore in recurring engineering and product development costs, and another ₹15,000-20,000 crore in investment in testing facilities, supplier localisation, and manufacturing upgrades, making it one of the largest automotive technology bets since BS-VI.“Investors should look at E100 as a strategic option, not as a guaranteed profit pool,” said Randheer Singh, former director of electric mobility at NITI Aayog and chief executive…