India’s CAFE III Car Fuel-Efficiency Rules: EVs Get 3x Credit, Small Cars Lose Special Benefit
India has notified the third phase of its Corporate Average Fuel Economy (CAFE III) regulations for passenger vehicles, setting a new framework for how carmakers will be measured on fuel efficiency and carbon emissions.
The rules will apply for five years from April 1, 2027, to March 31, 2032. One of the most important changes is the strong incentive for battery-electric vehicles, which can receive a 3x volume credit when manufacturers calculate their fleet-average performance. At the same time, the new framework does not provide a separate special concession for small cars.
What are CAFE III norms?
CAFE rules are designed to make car manufacturers improve the average fuel efficiency of the vehicles they sell in India.
Instead of judging every model separately against one identical target, the system calculates a manufacturer's fleet-level performance. This means a company selling a mix of petrol, diesel, CNG, hybrid and electric vehicles can use the performance of its overall portfolio to meet the prescribed standard.
CAFE III will apply to M1-category passenger vehicles, covering cars and other eligible passenger vehicles under the regulatory definition.
EVs receive a major 3x advantage
The biggest feature of the new framework is the 3.0 volume derogation factor for battery-electric vehicles and range-extended electric vehicles.
In simple terms, one eligible EV can be counted as three vehicles for the relevant fleet-average calculation.
Other cleaner technologies also receive different levels of credit. Plug-in hybrids and certain flex-fuel strong hybrids receive a 2.5 factor, strong hybrids receive 1.6, while flex-fuel ethanol vehicles receive 1.1.
This structure gives manufacturers a regulatory incentive to increase the share of electric and other lower-emission technologies in their product portfolios.
However, the credit itself does not mean an EV literally sells as three cars. It is a compliance mechanism used for calculating the manufacturer's fleet performance.
No separate special benefit for small cars
An important change from some earlier proposals is the absence of a dedicated additional concession for very small petrol cars.
The final framework instead uses a formula linked to the weighted average unladen mass of a manufacturer's fleet. The reference weight has been fixed at 1,229 kg.
This makes the regulatory calculation less dependent on a special carve-out for a particular small-car category.
For manufacturers, the implication is that vehicle size alone cannot provide the kind of additional benefit that had been contemplated in earlier versions of the CAFE framework.
Fuel-efficiency targets become tighter
CAFE III progressively tightens the manufacturer's annual fuel-consumption standard during the five-year period.
For a fleet with a weighted average unladen mass of 1,229 kg, the prescribed standard works out to:
| Financial year | Standard |
|---|---|
| 2027-28 | 3.9960 litres/100 km |
| 2028-29 | 3.8600 litres/100 km |
| 2029-30 | 3.7585 litres/100 km |
| 2030-31 | 3.5313 litres/100 km |
| 2031-32 | 3.3273 litres/100 km |
The formula becomes progressively more demanding toward the end of the CAFE III period.
For automakers, this means efficiency improvements will have to continue rather than being treated as a one-time compliance exercise.
Hybrids and alternative fuels also get recognition
CAFE III is not limited to battery-electric cars.
The rules provide different compliance benefits for hybrid and alternative-fuel technologies. They also introduce Carbon Neutrality Factors for certain fuel types.
For example, the framework provides an 8% carbon-neutrality factor for petrol vehicles using E20 or higher ethanol blends, including eligible hybrid and plug-in hybrid vehicles. Flex-fuel ethanol vehicles receive a 22.3% factor, while CNG vehicles receive a 5% factor or the applicable CBG blending percentage notified by the government, whichever is higher.
This gives automakers several technology pathways for improving their fleet-level compliance.
Fuel-saving technologies can provide additional relief
Manufacturers can also claim reductions for specified fuel-saving technologies.
The notification allows 1 g CO₂/km for each eligible technology, subject to an overall limit of 9 g CO₂/km.
The technologies include start-stop systems, tyre-pressure monitoring, regenerative braking, higher-speed transmissions, efficient alternators, motor-generators, LED lighting, advanced glazing, electric water pumps, efficient air-conditioning systems, solar-reflective paint and PWM-controlled radiator fans.
The certification framework will become more formal over time, with validated test results required for the second compliance block.
What happens if a manufacturer misses its target?
CAFE III introduces a credit-and-debit system.
A manufacturer that performs better than its prescribed standard can generate compliance credits. Manufacturers that fall short can have a debit balance.
Credits can be carried forward within the applicable compliance block, traded between manufacturers or used through other permitted mechanisms. The rules divide the five-year period into a three-year first block and a two-year second block.
Manufacturers can also buy credits from the Bureau of Energy Efficiency. The notified price starts at ₹2,500 per g CO₂/km in 2027-28 and rises to ₹4,500 by 2031-32.
What could CAFE III mean for carmakers?
The new framework is likely to make product planning increasingly important.
Carmakers will have to consider not only individual vehicle efficiency but also the composition of their entire portfolio. A manufacturer with a larger presence of EVs and qualifying cleaner technologies can receive additional compliance benefits through the credit mechanism.
At the same time, manufacturers relying heavily on conventional petrol or diesel models will have to continue improving their vehicles' efficiency to keep their fleet average within the prescribed limits.
The impact will therefore differ from one automaker to another depending on its product mix, technology investments and sales volumes.
What does it mean for car buyers?
CAFE III is primarily a regulation for manufacturers, so it does not directly impose a new fuel-efficiency requirement on individual car owners.
But consumers could eventually notice its effects through changes in vehicle technology and model portfolios.
Automakers may have greater reason to introduce more efficient engines, hybrids, EVs and fuel-saving features. Over time, regulatory pressure can therefore influence which technologies manufacturers prioritise when developing new cars.
It does not, however, automatically mean that every new car will become cheaper or that every model will deliver a specific improvement in real-world mileage. Actual fuel economy depends on the vehicle, driving conditions, traffic, driving style and other factors.
The bigger picture
CAFE III marks another step in India's effort to reduce the fuel consumption and carbon intensity of its passenger-vehicle fleet.
The combination of progressively tighter targets, a 3x credit for battery EVs, incentives for hybrid and alternative-fuel technologies, and a compliance-credit market creates multiple routes for manufacturers to meet the regulations.
The absence of a separate small-car concession also signals a broader approach in which manufacturers have to manage overall fleet efficiency rather than depending on a special benefit linked to vehicle size.
For India's automobile industry, the next five years will therefore involve not just selling more cars, but managing technology, efficiency and fleet composition together as regulatory requirements become progressively tighter.
