CAFE 3 norms: What do the new fuel-efficiency rules mean for you?

CAFE 3 will push automakers towards cleaner and more efficient powertrains, potentially bringing more EVs, hybrids and range-extender models to India as fuel-efficiency targets tighten from 2027.

The third phase of Corporate Average Fuel Economy (CAFE) norms will likely reshape the mix of petrol, hybrid, CNG, flex-fuel and electric cars sold in India over the next five years. The rules come into force on April 1, 2027, and apply until March 31, 2032.

Unlike an emission norm that applies to an individual car, CAFE works at the manufacturer level. In simple terms, an automaker's entire eligible passenger-vehicle portfolio has to meet a prescribed average fuel-consumption target. This means a company can balance higher-consuming SUVs with more efficient petrol cars, hybrids and EVs.

For buyers, that could eventually mean more electrified options, greater use of efficiency technologies and potentially a wider choice of hybrids and range-extender EVs.

What exactly is CAFE 3?

CAFE III sets a progressively stricter fuel-efficiency benchmark for carmakers. The target is linked to the average kerb weight of an automaker's fleet, with the revised formula giving lighter cars relatively more relaxed targets while requiring heavier vehicles to deliver greater efficiency.

For a manufacturer whose reference fleet weight is 1,229kg, the permitted average fuel consumption falls from 3.996 litres per 100km in FY2028 to 3.3273 litres per 100km in FY2032. In CO2 terms, that is a reduction from roughly 94.8g/km to 78.9g/km.

The important point for consumers is that this is a fleet-level requirement, rather than a mandate that every individual car must deliver those numbers.

EVs and range-extenders get a major advantage

CAFE III gives automakers considerably more compliance value for electrified vehicles. Battery EVs and range-extended EVs receive a 3x super-credit multiplier.

That could encourage manufacturers to introduce more range-extender models. These vehicles use an electric motor to drive the wheels but can use an internal-combustion engine as a generator to produce electricity when required. From a CAFE compliance perspective, they receive the same super-credit multiplier as battery EVs.

For buyers, this could mean more alternatives to a conventional petrol or diesel car without requiring every customer to make the switch to a pure EV.

Hybrids could become more common too

Strong hybrids receive a 1.6x multiplier, while plug-in hybrids and strong hybrids that run on flex-fuel ethanol receive a higher 2.5x multiplier.

This gives manufacturers another way of lowering their fleet-average fuel consumption without relying entirely on battery-electric vehicles. Plug-in hybrids, in particular, could become more relevant if carmakers use the additional CAFE credit to justify introducing them in India.

Flex-fuel vehicles also receive a 1.1x super credit, giving manufacturers another compliance route.

Does this mean cheaper or more efficient cars?

Not necessarily, at least not immediately.

CAFE rules regulate the average efficiency of an automaker's fleet. They do not directly dictate the showroom price or fuel economy of a particular model. However, manufacturers may respond by increasing the share of efficient powertrains and technologies in their portfolios.

The impact could therefore be visible in the kind of cars launched in India rather than through an immediate change in the fuel economy of every existing model.

Petrol and CNG cars are not left out

The new framework also recognises the use of alternative fuels.

Cars capable of running on E20 and higher notified ethanol-petrol blends receive an 8% carbon-neutrality adjustment. Flex-fuel ethanol vehicles receive a 22.3% adjustment, while CNG vehicles receive a 5% adjustment or the notified CBG blending percentage, whichever is higher.

This means manufacturers have several ways to improve their CAFE position, rather than having to rely solely on EVs and hybrids.

Your car could get more efficiency technology

CAFE III also gives manufacturers a limited compliance benefit for certain technologies. Each eligible technology can provide a 1g CO2/km reduction, with the overall benefit capped at 9g CO2/km.

The list includes features such as start-stop systems, tyre-pressure monitoring, regenerative braking, six-speed or higher gearboxes, efficient alternators, 12V/48V motor-generators, LED lighting, advanced glazing, electric water pumps and more efficient air-conditioning systems.

For consumers, some of these changes may be less obvious than a new hybrid or EV. They could instead appear as small efficiency improvements across regular petrol and diesel models.

What happens if a carmaker misses its target?

CAFE III introduces a credit-and-debit mechanism. Manufacturers that perform better than their prescribed fleet target can accumulate credits, while those that fall short build up debits.

The surplus credits can be traded between manufacturers. Carmakers can also purchase credits from the Bureau of Energy Efficiency (BEE) to settle outstanding debits. The cost increases from Rs 2,500 per g CO2/km in FY2028 to Rs 4,500 in FY2032.

This creates a financial incentive for manufacturers to improve fleet efficiency rather than simply absorbing the cost of missing their targets.

What about the CAFE 3 proposal for small cars?

One notable change from an earlier draft is the removal of the additional 3g CO2/km benefit that had been proposed for certain petrol cars measuring under four metres.

The final framework therefore does not retain that specific advantage for small petrol cars.

At the same time, the reference fleet weight has increased from 1,082kg under the existing norms to 1,229kg under CAFE III. That reflects the increasing average weight of India's passenger-vehicle fleet.

WLTP will become part of the picture

From April 1, 2027, manufacturers will have to report the CO2 performance of each model under both the Modified Indian Driving Cycle (MIDC) and Worldwide Harmonised Light Vehicles Test Procedure (WLTP).

The conversion factor needed to translate the CAFE target from MIDC to WLTP is still to be notified separately by the Ministry of Power in consultation with the BEE.

For buyers, this could eventually make international fuel-efficiency comparisons easier, although MIDC figures will continue to remain relevant during the transition.

What CAFE 3 ultimately means for car buyers

CAFE III does not mean that every new car sold from 2027 will suddenly become dramatically more fuel efficient. Instead, it changes the incentives for manufacturers across their entire portfolios.

The strongest incentives are now attached to EVs and range-extender EVs, followed by plug-in hybrids and flex-fuel strong hybrids. Conventional petrol, CNG and flex-fuel vehicles also get compliance benefits, while efficiency technologies provide another limited route.

As manufacturers plan their portfolios around the progressively tighter targets, buyers could see more EVs, hybrids, range-extender vehicles and alternative-fuel models, alongside incremental efficiency improvements to conventional cars. The exact mix, however, will depend on how individual automakers choose to meet their fleet-average targets.

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