CAFE III will reshape the economics of technology choices in India’s passenger vehicle market

The government is likely to notify the final Corporate Average Fuel Economy (CAFE) III norms by the end of this month, with industry executives expressing growing confidence that the long-awaited fuel-efficiency rules are nearing completion despite a last-minute recalibration to align the framework with India’s accelerated ethanol roadmap.

Industry sources said the matter has received attention at the highest levels of government, with the Prime Minister’s Office understood to have urged the Bureau of Energy Efficiency (BEE) not to let technical recalibration related to the shift from E20 to E25 delay the final notification. The BEE is updating the core compliance formula, but industry experts say the revision is technical and will not delay the final rules.

“All the discussions that had to be done have been done. The expectation is that the final notification comes out by the end of this month,” a top automotive industry executive involved in every round of consultations with the government told businessline.

People familiar with the discussions said the urgency reflects the government’s broader objective of reducing dependence on imported crude, expanding ethanol use and accelerating cleaner technologies.

“The remaining inputs are largely suggestions, not objections,” another senior industry official said. “OEMs need time to finalise their powertrain mix plans going forward. Time is of the essence.”

businessline also spoke to experts in the regulatory and certification ecosystem, who said the latest behind-the-scenes revision—effectively a fourth sub-iteration of the draft—recalibrates the reference fuel from E20 to E25/E27 to align the framework with India’s accelerated ethanol roadmap.

They said the exercise primarily involves updating the chemical and conversion-factor assumptions used to calculate certified CO₂ emissions during laboratory testing rather than rewriting the policy architecture, which is why it is not expected to delay the final notification.

In practical terms, the core CAFE III targets remain unchanged; only the underlying chemistry and conversion math are being updated so automakers are assessed on vehicle efficiency rather than being penalised for the properties of a higher-ethanol fuel.

The compliance economics

The final norms will leave automakers with less than 11 months to prepare for implementation from April 1, 2027, forcing them to lock in product plans, supplier contracts and capital-allocation decisions.

More importantly, CAFE III will reshape the economics of technology choices in India’s passenger vehicle market.

The framework will determine not only fleet-average fuel-efficiency targets but also how compliance credits are assigned to battery electric vehicles, strong hybrids and flex-fuel technologies. Those rules will influence which powertrains are cheaper or costlier to deploy and how future vehicles are priced to remain within compliance limits.

Industry executives at leading passenger vehicle manufacturers said incorporating E25 into the testing baseline could provide an implicit compliance cushion, as higher ethanol content lowers the certified carbon intensity of petrol on paper. Combined with proposed super-credits for flex-fuel vehicles, this could ease near-term compliance pressure and broaden the technology options available to manufacturers.

Leading automakers are already preparing distinct flex-fuel strategies. Maruti Suzuki is expected to deploy ethanol-compatible technology in high-volume models, Toyota Kirloskar Motor is combining flex-fuel engines with strong hybrids, and Tata Motors has said its flex-fuel technology is ready for launch around late 2026 or early 2027.

In effect, CAFE III will do far more than set an emissions benchmark. With automakers already finalising FY28 product and powertrain strategies, the rules will determine which technologies gain a cost advantage. For the industry, consultations are effectively complete; what manufacturers need now is the final rulebook that will shape technology bets, capital allocation and competitive positioning through the rest of the decade. Without regulatory clarity, companies risk delaying supplier commitments and investments across hybrid, electric and flex-fuel platforms.

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Published on May 17, 2026