For years, Indian car buyers have looked at the “claimed mileage” on showroom brochures with a healthy dose of skepticism. The gap between laboratory-tested figures and actual on-road performance has often been wide. However, that is about to change. India has officially taken its first step toward the Worldwide Harmonized Light Vehicles Test Procedure (WLTP), a more rigorous and realistic global testing standard.
Leading this transition is Toyota Kirloskar Motor. On May 11, 2026, the Lexus LM 350h luxury hybrid MPV became the first vehicle in India to receive official WLTP certification under the AIS:175 regulations.
1. What is WLTP and Why Does it Matter?
Currently, fuel efficiency in India is measured using the Modified Indian Driving Cycle (MIDC). While reliable for basic comparisons, MIDC has been criticized for being too optimistic because it uses a fixed speed-time pattern in a controlled laboratory environment.
WLTP, developed by the United Nations, is a much tougher “rolling road” test. Compared to the older system, the WLTP cycle includes:
- Higher Speeds: Reflecting modern highway driving.
- More Dynamic Phases: Frequent braking and harder acceleration.
- Real-World Variables: It factors in vehicle weight, aerodynamics, and even the power consumption of optional equipment like air conditioning.
2. The Lexus LM 350h: The First “Star” of AIS:175
The Automotive Research Association of India (ARAI) presented the first-ever WLTP compliance certificate to Toyota for its flagship Lexus LM 350h. This 2.5-litre petrol-hybrid powerhouse is the perfect candidate for this debut, as hybrid efficiency is notoriously difficult to capture accurately under older laboratory cycles.
By voluntarily seeking certification a year ahead of the mandate, Lexus is signaling a commitment to transparency. For the end consumer, this means the mileage figures on the LM 350h’s spec sheet will now be much closer to what they experience while being chauffeured through city traffic or cruising on the expressway.
3. Timeline: The Road to April 1, 2027
While the Lexus LM is the first, it certainly won’t be the last. The Ministry of Road Transport and Highways (MoRTH) has set a firm deadline:
- Mandatory Implementation: From April 1, 2027, all new M1 (passenger cars) and M2 (commercial vans/buses under 5 tonnes) category vehicles must comply with WLTP.
- Existing Models: Models currently on sale will also need to be re-certified if they continue production after the 2027 cutoff.
| Feature | MIDC (Current) | WLTP (Upcoming) |
| Testing Environment | Laboratory / Fixed Pattern | Laboratory / Dynamic & Varied |
| Average Speed | ~33 km/h | ~46.5 km/h |
| Top Speed | 90 km/h | 131 km/h |
| Accuracy | Optimistic / Lab-centric | Realistic / Driving-centric |
The “Brochure Drop”: What Buyers Should Expect
As more manufacturers like Mahindra, Tata Motors, and Hyundai begin their validation processes, buyers should prepare for a “brochure drop.” This doesn’t mean cars are becoming less efficient; rather, the reported numbers will decrease to reflect reality. An EV that currently claims a 500 km range under MIDC might see that figure revised to 380–400 km under WLTP.
Conclusion
The adoption of WLTP marks a significant maturing of the Indian automotive sector. By aligning with international norms, India is ensuring that “transparency” isn’t just a buzzword, but a measurable standard. As we move toward the 2027 deadline, the Lexus LM 350h stands as the first proof that the era of “lab-only” mileage is finally coming to an end.
