Tata Sierra achieves 29.9kmpl, 222kmph at NATRAX, but with a catch.

• Tata Sierra achieved 29.9kmpl mileage and 222kmph top speed in controlled tests at NATRAX.
• The 29.9kmpl figure was from a 12-hour continuous run on Nov 30, 2025, using the 1.5L Hyperion engine, setting an India Book of Records entry.
• The 222kmph top speed was achieved on a closed track and is not representative of public road performance.
• Customer-spec Tata Sierra models will be electronically limited to 190kmph for safety, and customers are advised not to attempt replicating test conditions.
• The Sierra offers multiple powertrains, including a 1.5L Hyperion T-GDi petrol, and is available in seven trims with deliveries starting January 15.

Why It Matters: Tata Sierra's record mileage/speed are under test conditions, not for public roads.