The Indian government has introduced a significant proposal affecting fuel efficiency testing for passenger vehicles. Under the recommendation by the Ministry of Road Transport and Highways (MoRTH), all Automotive Research Association of India (ARAI) certified cars will be required to undergo mileage testing with the air-conditioning (AC) switched on starting October 1, 2026.
Currently, ARAI testing procedures measure fuel efficiency under ideal conditions, often with AC turned off, which can lead to discrepancies between certified and actual mileage experienced by vehicle owners. Air-conditioning usage is known to increase fuel consumption, especially in hot climates, and studies show a reduction of up to 10–15% in fuel economy depending on the vehicle type and ambient temperature.
By making AC-on testing mandatory, MoRTH aims to align certification figures with real-world scenarios, giving buyers a more accurate understanding of vehicle performance. The policy also seeks to enhance transparency and improve consumer trust in official fuel efficiency ratings.
Automakers are now expected to adapt their testing and reporting procedures to comply with this revised methodology. While this change is expected to slightly reduce ARAI-reported mileage numbers, it also encourages manufacturers to develop vehicles with more efficient AC systems and enhanced energy management. Some companies may introduce eco-mode AC settings or more efficient compressors to mitigate the drop in fuel efficiency, balancing comfort and economy.
Industry analysts suggest that this shift could also influence vehicle pricing and marketing strategies, as fuel efficiency claims often play a pivotal role in consumer purchasing decisions. Cars with lower fuel consumption have historically commanded higher market preference, and accurate reporting will help buyers make informed choices.
The MoRTH proposal follows a global trend where real-driving fuel consumption testing has become more prevalent. Countries such as the European Union and Japan have implemented AC-on or real-world driving tests to provide consumers with data that reflects daily vehicle usage more accurately. India’s adoption of similar measures signals a commitment to consumer protection, environmental responsibility, and transparency in the automotive sector.
In addition to mileage testing, the proposal encourages automakers to focus on fuel-efficient technologies, hybrid systems, and lightweight materials to maintain high performance standards without compromising real-world economy. This initiative could also contribute to India’s climate goals by promoting vehicles with lower fuel consumption and reduced carbon emissions.
In conclusion, the proposed AC-on fuel efficiency testing for ARAI-certified vehicles marks a significant step toward realistic and consumer-friendly reporting of car mileage in India. While certified numbers may see a modest reduction, the policy will provide drivers with reliable data that mirrors everyday driving conditions and encourages automakers to innovate for energy-efficient cooling solutions, ultimately benefiting both consumers and the environment.
