For two decades, buying a car in India came with a simple rule of thumb: petrol for the city, diesel if you clocked serious kilometers. That logic has quietly collapsed. In 2026, a buyer must weigh volatile fuel prices, shifting emission norms, generous electric vehicle subsidies, and a charging network that is still finding its feet. The stakes are real, because the wrong powertrain does not merely disappoint you. It bleeds money every month and punishes you again at resale. This guide cuts through the noise with an honest, India-specific comparison of petrol, diesel, and electric cars, so you can match the right one to how you actually drive.