Govt Mandates AC-On Fuel Efficiency Tests for Cars from 2026
India's road transport ministry has proposed a significant change in how car fuel efficiency gets tested. The ministry wants mandatory testing with the air-conditioning system both switched on and off. This move aims to provide more realistic and accurate mileage figures for consumers.
New Testing Requirements for All Vehicles
The proposed regulation will apply to all cars manufactured or imported in India. This includes both Internal Combustion Engine vehicles and electric vehicles. The new rules are scheduled to take effect from October 1, 2026.
Officials explained that car manufacturers and importers will need to display mileage figures for both AC-on and AC-off conditions. These figures must appear in vehicle user manuals and on company websites. Currently, manufacturers only provide mileage data without AC operation.
Addressing the Reality Gap
Government officials noted that current fuel-efficiency figures often fail to reflect actual on-road performance. This creates a noticeable gap between claimed mileage and what drivers actually experience. The ministry believes AC usage significantly impacts both mileage and energy consumption during real-world driving.
"On and after October 1, 2026, all vehicles of category M1 (cars), manufactured or imported in India, shall be tested for measurement of fuel consumption with air-conditioning system in operation," stated the draft notification issued on Thursday.
Aligning with Indian Conditions
Car manufacturers have traditionally followed European testing norms. These norms only consider mileage without air-conditioning. However, Indian officials argue that this approach doesn't suit India's climate conditions where AC use is frequent and prolonged.
The new testing will follow AIS-213 standards. This standard lays down detailed procedures for measuring vehicle emissions and fuel consumption while the AC system operates. It specifically captures additional fuel use and emissions generated due to AC load.
Broader Consumer Awareness Framework
The ministry is reportedly working on a broader framework to increase consumer awareness about vehicle emissions. In the near future, car owners might receive exact information about their vehicle's emission levels. This initiative complements the new fuel efficiency testing requirements.
Officials expect these changes to improve transparency in the automotive sector. Consumers should gain better information to make informed purchasing decisions. The move represents a significant shift toward more honest representation of vehicle performance under actual Indian driving conditions.
