India plans to require car mileage testing with the AC on and off for clearer real-world figures
The Union road transport ministry has proposed a new requirement for passenger vehicles that would mandate fuel-efficiency testing with the air-conditioning system switched on, in a bid to provide consumers with figures that more closely mirror real driving conditions.
Under the draft regulation, applicable to category M1 vehicles, all cars manufactured in or imported into India from October 1, 2026, must undergo mileage testing both with the AC running and without it, according to officials. The results will have to be published in the vehicle user manuals and on manufacturers’ websites.
Until now, automakers in India have typically reported fuel-efficiency data based on tests conducted with the AC turned off, a practice aligned with existing European testing norms. Critics argue that such figures can be misleading because air-conditioning use significantly affects fuel consumption in daily use.
The proposed requirement refers to AIS-213, the automotive industry standard that specifies procedures for measuring fuel use and emissions with the AC system in operation. Government sources say this is aimed at giving buyers a clearer picture of the real-world impact of air-conditioning on mileage and emissions.
Industry representatives have noted that current global standards often exclude AC usage in official testing protocols, but regulators contend that the new approach will enhance transparency for Indian consumers. Officials also indicated that the transport ministry is considering additional measures to improve public awareness of vehicle emissions and efficiency.
As the draft notification undergoes stakeholder consultation, carmakers and consumer groups are expected to weigh in on implementation details and timelines.
