The Union Ministry of Road Transport and Highways has introduced a draft regulation aimed at providing car buyers with more accurate fuel efficiency data. Starting October 1, 2026, all passenger vehicles within the M1 category—whether manufactured locally or imported—must undergo mileage testing with the air-conditioning (AC) system active. This new requirement seeks to bridge the gap between laboratory results and real-world driving conditions, where AC usage is a standard practice for Indian motorists.
Revised Testing Standards and Disclosure
Under the proposed rule, automakers will be required to conduct dual testing: one cycle with the AC system running and another with it turned off. The findings from these tests must be transparently shared with consumers through specific channels:
- Vehicle user manuals provided at the time of purchase
- Official manufacturer and brand websites
The testing will be conducted in accordance with AIS-213, an automotive industry standard that establishes the methodology for measuring fuel consumption and tailpipe emissions while the climate control system is operational.
Shift from European-Based Protocols
Currently, the Indian automotive industry follows testing norms that largely align with European standards, which typically record fuel economy with the AC deactivated. While this provides a consistent baseline for engine performance, it often results in optimistic mileage figures that consumers struggle to replicate in daily use. Regulators argue that because AC operation significantly impacts fuel consumption and emissions, the new mandate is essential for consumer transparency.
Industry Impact and Timeline
While industry representatives have noted that AC-on testing is not a universal requirement in many global markets, the Indian government maintains that the move is necessary for the local climate and driving environment. The Ministry is also exploring further initiatives to increase public awareness regarding vehicle efficiency and environmental impact. The draft is currently in a consultation phase, allowing stakeholders, including car manufacturers and consumer groups, to submit feedback on the implementation process and the October 2026 deadline.
