CAFE III Explained: How India's New Fuel-Efficiency Rules Will Reshape the Cars You Can Buy

What Exactly Are the CAFE III Norms?

Corporate Average Fuel Economy, or CAFE, is a set of fleet-level fuel-efficiency standards for passenger vehicles, first introduced in India in 2017 under the Energy Conservation Act. The idea is simple and slightly counterintuitive: instead of forcing every individual car to hit the same mileage figure, the rules give each manufacturer a single report card based on the average fuel consumption of all the cars it sells. A maker of heavy SUVs is allowed a higher average than a maker of small hatchbacks, but each must stay within a target calculated from the weighted average unladen weight of its fleet.

India's new third phase, CAFE III, was notified by the Ministry of Power on 29 September 2026 and applies from 1 April 2027 to 31 March 2032. It covers M1 category passenger vehicles manufactured or imported for sale in India. The first CAFE III proposal dates back to 2024, and the final rules went through several revisions covering the weight formula, the treatment of different powertrains and the compliance mechanism before they were signed off.

If you have followed India's emission rules only loosely, the short version is this: the exam has got tougher, but carmakers have been handed many more ways to pass it. Understanding that tension explains almost everything that will happen to showroom line-ups between now and 2032.

The Headline Squeeze: 16.7 Per Cent in Five Years

At the reference fleet weight of 1,229 kg, the fuel-consumption standard starts at 3.996 litres per 100 km in FY28 and tightens to 3.3273 litres per 100 km in FY32. That is an improvement of about 16.7 per cent over five years, roughly equivalent to moving from 25 km/l to 30 km/l on a petrol-equivalent basis.

Two changes matter more than the headline number. First, the reference weight has been raised to 1,229 kg from 1,082 kg, reflecting the fact that Indian cars are getting heavier. Second, the weight adjustment has been flattened: the annual multiplier declines from 0.00158 in FY28 to 0.00131 in FY32, which spreads the benefit more evenly. The net effect is that lighter fleets, including those weighted towards small cars such as Maruti Suzuki, Renault and Nissan, get a softer target than the earlier draft would have given them, while very heavy fleets, including makers of large petrol and diesel SUVs, face a materially stricter standard.

The draft's special 3 g CO2/km concession for petrol cars under 909 kg has been dropped entirely. The government settled a long-running dispute with the industry not by carving out a category for small cars, but by changing the master equation itself. On the final formula, a 909-kg average fleet gets roughly nine per cent more allowance in FY28 and nearly 17 per cent more by FY32 than the draft implied, while an 1,800-kg fleet is a few per cent tighter.

How EVs, Hybrids and Alternative Fuels Fit In

The biggest single change from the first proposal is that the EV advantage has been trimmed but spread wider. The June 2024 draft had floated a 4x factor for battery-electric vehicles; the final framework gives them 3.0x, and extends compliance value to a much longer list of cleaner technologies. In practice, selling 10,000 battery-electric vehicles now counts as 30,000 units in the fleet-average calculation, which is a powerful lever for a maker with a large EV line-up.

Alongside super-credits, CAFE III introduces a Carbon Neutrality Factor, which discounts a vehicle's declared tailpipe CO2 emissions to account for the carbon benefit of the fuel it burns. Vehicles running on E20 or higher ethanol blends, including strong hybrids and plug-in hybrids, get an 8 per cent discount. Flex-fuel ethanol vehicles, which can run on blends up to 85 per cent or even 100 per cent ethanol, get 22.3 per cent. CNG gets 5 per cent or the notified compressed-biogas blending percentage, whichever is higher, and diesel gets a benefit tied to its actual biofuel blend.

There is also a technology credit list that has grown from four items to twelve. Features such as start-stop systems, tyre-pressure monitoring, regenerative braking, six-speed-or-higher transmissions, LED lighting, efficient alternators, electric water pumps and smarter air-conditioning can each earn 1 g CO2/km, subject to a total cap of 9 g CO2/km. In the first compliance block, these can be self-declared; from FY31 they will require validated testing.

This is the part that quietly changes the maths. Analysts at the International Council on Clean Transportation have noted that the headline stringency is real, but the flexibilities stack up, so the actual reduction in fuel use on the road could end up considerably smaller than the target suggests. For carmakers heavily invested in pure battery EVs, such as Tata Motors and Mahindra, the wider menu of compliant technologies could dilute the pure-EV push, while European and Korean brands that have stayed away from large local EV investments now have an alternative route through hybrids, plug-in hybrids and efficient petrol.

Why the Small-Car Fight Mattered

For more than two years, the CAFE III file was one of the most contested in the Indian auto industry, and the flashpoint was the small car. The September 2025 draft had proposed a special concession for petrol cars weighing up to 909 kg, deducting 3 g CO2/km from their emissions figure when a manufacturer's fleet performance was calculated. Maruti Suzuki India, the country's dominant small-car maker, had pushed hard for exactly this relief, and the draft appeared to give it. When the final notification arrived, the concession was gone.

What replaced it was subtler and, in the government's view, fairer. Instead of carving out a special category for small cars, the final rules changed the master equation used to set every manufacturer's target. The reference weight moved to 1,229 kg and the weight adjustment was flattened, so lighter fleets now get a softer target and heavier fleets a harder one. On the numbers, a 909-kg average fleet gains about nine per cent more allowance in FY28 and nearly 17 per cent more by FY32 than the draft would have given it, while a 2,500-kg fleet is significantly tighter. In effect, the government delivered relief to light-car makers without writing a rule that named them.

The episode matters for buyers because it tells you where the policy is pointing. The government resisted segment-specific carve-outs and chose a technology-neutral, weight-sensitive formula that rewards efficiency wherever it is found. That is why the final rules lean on super-credits, carbon-neutrality factors and technology credits rather than mandating a single winning powertrain, and why the door is open to hybrids, plug-in hybrids, range extenders and ethanol-compatible engines as much as to pure EVs.

How Compliance and Penalties Work

Rather than a pass-or-fail test every single year, CAFE III creates a passbook of credits and debits at the manufacturer level, and splits the five-year period into two compliance blocks: FY28 to FY30, and FY31 to FY32. A manufacturer whose fleet beats its target earns a credit; one that misses it records a debit. A deficit in one year can be offset by a surplus within the same block, and manufacturers can trade credits with one another on mutually agreed terms.

A company still carrying a deficit at the end of a block can buy credits from the Bureau of Energy Efficiency, but the price climbs every year, from Rs 2,500 per g CO2/km in FY28 to Rs 4,500 by FY32. That is not trivial. As one analysis put it, a 1 g/km deficit across one lakh vehicles would imply a Rs 25-crore buyout at the FY28 rate, before any other offsets. The trading window runs from 1 to 31 October each year, and manufacturers must also report state-wise sales data annually. From April 2027, they must declare each model's performance on both the Modified Indian Driving Cycle and the Worldwide Harmonised Light Vehicles Test Procedure, with the conversion factor between the two to be notified separately.

What This Means for You

CAFE III is a regulation for carmakers, not a direct requirement on individual owners, so no one is going to force you to buy an electric car. What it does is reshape the incentives that decide which cars get built and brought to India. Expect a broader spread of strong hybrids, CNG variants, ethanol-compatible engines and more efficient petrol cars alongside EVs, because each of those now earns compliance value.

For a buyer planning a purchase after April 2027, the practical upside is more choice in efficient powertrains and, over time, better real-world fuel economy across the board. The practical caution is that a manufacturer can meet its fleet target without every single model becoming dramatically more frugal, so the brochure figure on the specific variant you like is still the number that matters. Compare running costs, not just labels, and weigh how you actually drive. If you want to put two models side by side, our AUTOINDIA compare tool lays out the specs and prices in one view, and our policy and market coverage tracks what each new norm means in showrooms.

(Sources: Ministry of Power CAFE III notification, 29 September 2026, via ETAuto and The Economic Times, The Hindu BusinessLine explainer, Indian Express explained, Autocar Professional, Times of India, Business Standard)