Road transport contributes 12% of India's energy-related CO2 emissions and is a major source of urban air pollution. These emissions have tripled since 1990, driven by rapid urbanization and the growing demand for private vehicles. Without a shift away from fossil fuels, these trends will intensify climate and air quality challenges. Among sustainable alternatives, electric vehicles (EVs) have emerged as a promising solution. However, a comprehensive understanding of their environmental performance, particularly in the Indian context, is essential for informed decision-making. This study employs a Cradle-to-Grave Life Cycle Assessment (LCA) to evaluate the environmental impacts of typical passenger vehicle with a ICE engine compared to its EV powertrain. Key life cycle stages-manufacturing, transportation, distribution, maintenance, and end-of-life-are analysed using real-world data wherever feasible. To capture the evolving energy landscape, the study incorporates India's projected grid evolution, considering increased renewable energy adoption in 2025, 2030, and 2040 to evaluate use phase impacts. The findings reveal that over a 150,000 km vehicle lifetime, EVs demonstrate 14-38% lower CO2-equivalent emissions compared to ICE vehicles, depending on the pace of grid decarbonisation and policy implementation. The study also include the scenarios with use of 50% & 100% use of roof top solar energy for charging the vehicle. The analysis also identifies a break-even mileage threshold, after which EVs deliver superior environmental performance compared to their diesel counterparts. This study provides actionable insights into the environmental benefits of EVs and highlights the crucial role of renewable energy integration and supportive policy frameworks. By presenting a robust evaluation, it emphasizes the extensive potential of EVs in advancing India's sustainable mobility goals and highlights the importance of accelerating the transition toward greener transportation systems. Keywords: Sustainable Mobility, Electric Vehicles (EVs), Life Cycle Assessment (LCA), Cradle-to-Grave Analysis, Renewable Energy Integration, Grid Evolution, Internal Combustion Engine (ICE)