THE BREAKDOWN ICCT 2025 ranks Tata first at about 106 Wh/km and Mahindra second at 113 Wh/km. If the same Indian models kept low Wh/km under EPA testing, they could use smaller batteries for similar range, cutting cost and weight. Its battery-electric models now top a global energy-efficiency ranking ahead of Tesla and BYD, with Mahindra right behind. On paper, Indian EVs sip less energy per mile than the usual efficiency darlings. The Tata Sierra.ev is listed with 63 kWh and 75 kWh battery options and certified ranges up to 413 miles.