Draft rules propose fuel consumption tests with air conditioning on to reflect real-world usage in passenger vehicles
The Ministry of Road Transport and Highways issued a draft amendment to the Central Motor Vehicles Rules. It proposes mandatory AC-on mileage testing for all M1 category passenger vehicles from October 1, 2026.
This change matters because current tests are conducted without air conditioning. Real-world driving in India often includes AC use, especially in hot climates. The new rule uses the AIS-213 standard to measure fuel consumption with AC operating.
Context of Current Testing Practices
At present, manufacturers declare fuel efficiency based on tests without AC. This leads to differences between lab figures and actual on-road performance. The draft applies to all cars manufactured or imported in India, including ICE and electric vehicles where relevant.
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Implications for Manufacturers and Compliance
The rule tightens requirements under the new AIS-213 protocol. Manufacturers must adapt testing processes. They will likely need to display both with-AC and without-AC figures in user manuals and on websites. Public comments on the draft remain open for 30 days.
The shift aligns with evolving vehicle use patterns in India. AC operation has become common even in entry-level models. This adjustment bridges the gap between advertised and practical fuel consumption.
Beyond the Spec Sheet
AC-on mileage testing yields figures closer to those in daily driving conditions. Commuters in warm regions experience more accurate expectations for fuel costs on routine trips. Families on long drives face fewer surprises in range during summer travel.
Fleet operators gain better data for planning fuel budgets across goods movement. Urban drivers adjust their behaviour around realistic consumption when the AC runs in traffic. Access to transparent numbers supports decisions on vehicle choice for long-term cost management.
