The Tata Tiago and the Tata Altroz are two of Tata’s best-known hatchbacks, but they serve different buyers. The Tiago is the brand’s entry-level car, focused on low cost and easy city use. The Altroz sits a step higher as a premium hatchback, with more space, more features and a wider choice of engines. Both cars have been updated recently. The Tiago received a full facelift in May 2026, while the Altroz, facelifted in 2025, added a CNG automatic option in May 2026. Under the bonnet, both use a 1.2-litre three-cylinder petrol engine, and both offer factory-fitted CNG with a choice of manual or AMT. The Altroz also adds a dual-clutch automatic and a diesel engine. In this comparison, we go through the claimed and tested mileage of both hatchbacks, what each one costs to run every month, and how their prices compare.
Table of Contents
Tata Tiago vs Tata Altroz: Specifications
The two hatchbacks share a similar 1.2-litre petrol engine, though the Altroz version is tuned for slightly more power. Where they really differ is choice. The Tiago keeps things simple with petrol and CNG, while the Altroz adds a dual-clutch automatic and a diesel engine to the mix.
| Specification | Tata Tiago | Tata Altroz |
| 1.2L petrol | 86 PS / 113 Nm | 88 PS / 115 Nm |
| 1.2L CNG | 73.4 PS / 95 Nm | 73.5 PS / 103 Nm |
| 1.5L diesel | Not offered | 90 PS / 200 Nm |
| Petrol gearboxes | 5-speed MT or AMT | 5-speed MT, AMT or 6-speed DCA |
| CNG gearboxes | 5-speed MT or AMT | 5-speed MT or AMT |
| Fuel tank | 35 litres | 37 litres |
| Boot space (petrol) | 242 litres | 345 litres |
Both cars use a twin-cylinder CNG setup that sits under the boot floor, so you still get some usable luggage space with CNG.
Also Read: Complete Guide to Buying a Tata Altroz
Tata Tiago vs Tata Altroz: ARAI Mileage Figures
On the petrol side, the claimed figures are almost level. The Tiago is rated at 19.01 km/l and the Altroz manual at 19.33 km/l, while the Altroz DCA comes in a little lower at 18.50 km/l. With CNG, the gearbox makes a noticeable difference. The Tiago CNG AMT is rated at 28.06 km/kg, which is higher than its own manual version at 26.49 km/kg. The Altroz CNG is rated at 27.8 km/kg, and the Altroz diesel at 23.60 km/l.
| Variant | Tiago | Altroz |
| Petrol MT | 19.01 km/l | 19.33 km/l |
| Petrol DCA | Not offered | 18.50 km/l |
| CNG MT | 26.49 km/kg | 27.8 km/kg |
| CNG AMT | 28.06 km/kg | Not yet confirmed |
| Diesel MT | Not offered | 23.60 km/l |
*As always, these are lab results. Your own numbers will depend on traffic, load and how often the AC is on.
Tata Tiago vs Tata Altroz: Real World Fuel Efficiency
In instrumented testing, the Tiago petrol manual returned around 13.3 km/l in the city and 16.6 km/l on the highway. The Altroz petrol DCA did a little worse in town at about 10.45 km/l, but pulled ahead on the open road with roughly 18.36 km/l.
The CNG results are where things get interesting. The Tiago CNG manual gave about 17 km/kg in the city and 33 km/kg on the highway, while the CNG AMT was more even, at around 21.1 km/kg in the city and 22 km/kg on the highway. The Altroz CNG manual was the strongest of the lot, with about 19.80 km/kg in the city and 34.58 km/kg on the highway.
| Version | City | Highway | 50:50 mixed |
| Tiago petrol MT | 13.3 km/l | 16.6 km/l | 14.77 km/l |
| Altroz petrol DCA | 10.45 km/l | 18.36 km/l | 13.32 km/l |
| Tiago CNG MT | 17 km/kg | 33 km/kg | 22.44 km/kg |
| Tiago CNG AMT | 21.1 km/kg | 22 km/kg | 21.54 km/kg |
| Altroz CNG MT | 19.80 km/kg | 34.58 km/kg | 25.18 km/kg |
A couple of things stand out. In petrol form, the lighter Tiago is easier on fuel in daily traffic, while the Altroz DCA does better on long drives. With CNG, the Altroz has the edge overall, helped by its very strong highway figure. Keep in mind that the Tiago petrol figure comes from a test of the earlier model. Since the facelift uses the same engine and gearboxes, you can expect similar results. Tested figures for the Altroz diesel, the Altroz petrol manual and the new Altroz CNG AMT aren’t available yet.
Tata Tiago vs Tata Altroz: Fuel Cost Comparison
To work out running costs, we’ve assumed 1,000 km a month, split evenly between city and highway, or 12,000 km a year. We’ve used ₹100 per litre for petrol and ₹80 per kg for CNG as round reference prices, so please adjust these for your city.
| Version | Mixed mileage | Cost per km | Monthly (1,000 km) | Yearly (12,000 km) |
| Tiago petrol MT | 14.77 km/l | ₹6.77 | ₹6,772 | ₹81,264 |
| Altroz petrol DCA | 13.32 km/l | ₹7.51 | ₹7,508 | ₹90,096 |
| Tiago CNG MT | 22.44 km/kg | ₹3.56 | ₹3,565 | ₹42,778 |
| Tiago CNG AMT | 21.54 km/kg | ₹3.71 | ₹3,714 | ₹44,563 |
| Altroz CNG MT | 25.18 km/kg | ₹3.18 | ₹3,177 | ₹38,122 |
The big takeaway here is CNG. Whichever car you pick, switching from petrol to CNG roughly halves your monthly fuel spend. Between the two CNG cars, the Altroz works out about ₹400 a month cheaper to run than the Tiago, based on these tests. On petrol, the Tiago manual is the more economical choice, saving around ₹700 a month compared to the Altroz DCA.
Also Read: Tata Tiago Mileage Comparison: Petrol vs CNG vs Electric
Tata Tiago vs Tata Altroz: Price Comparison
The Tiago is clearly the more affordable of the two. The facelifted model is priced from about ₹4.69 lakh to ₹8.55 lakh, with CNG versions starting at around ₹5.79 lakh. The Altroz costs about ₹6 lakh to ₹10.90 lakh, and its new CNG AMT variants range from about ₹8.70 lakh to ₹10.77 lakh (all ex-showroom).
| Car | Approx. ex-showroom price |
| Tata Tiago | ₹4.69 lakh to ₹8.55 lakh |
| Tata Tiago CNG | From ₹5.79 lakh |
| Tata Altroz | ₹6.00 lakh to ₹10.90 lakh |
| Tata Altroz CNG AMT | ₹8.70 lakh to ₹10.77 lakh |
So the extra money for the Altroz doesn’t buy you a much lower fuel bill. What it does get you is a bigger cabin and boot, a more premium feel, and more engine and gearbox choices, including the diesel.
Buying used? The Tiago has been on sale since 2016 and the Altroz since 2020, so you’ll find plenty of pre-owned examples of both on Spinny. Since the engines haven’t changed much over the years, an older car should give you mileage close to the figures above. If you’re shortlisting a CNG car on Spinny, go through its inspection report and service history, and check the cylinder testing certificate before you finalise. Every Spinny Assured car goes through a 200-point inspection and comes with a 1-year warranty, fixed pricing and a 5-day money-back guarantee.
Summary
With petrol, the two hatchbacks are close, and the choice depends on where you drive. The Tiago is the better bet for city commutes, while the Altroz DCA holds up better on highway trips. With CNG, both cars become very cheap to run. The Altroz CNG returned the best overall mileage in testing, and the Tiago CNG AMT gives you the ease of an automatic at a much lower price. Put simply, pick the Tiago if you want the lowest buying price and running cost in a compact city car. Pick the Altroz if you need more space, a more premium cabin, or options like the DCA automatic and diesel engine.
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FAQs about Tata Tiago and Tata Altroz Mileage Comparison
Q. Has the 2026 Tiago facelift changed its mileage?
The facelift brought new styling and more features, but kept the same 1.2-litre petrol and CNG engines with manual and AMT gearboxes. So you can expect mileage similar to the earlier model.
Q. Which is more fuel-efficient, the Tiago CNG manual or the CNG AMT?
The AMT is ahead, at 28.06 km/kg against 26.49 km/kg for the manual. In testing, the manual did much better on the highway, while the AMT was better in the city. If most of your driving is in town, the AMT is a sensible pick.
Q. What is the mileage of the new Altroz CNG AMT?
The Altroz CNG AMT went on sale in May 2026, and real-world figures aren’t available yet. For reference, the Altroz CNG manual returned around 25 km/kg in mixed driving during testing.
Q. Is the Altroz diesel still available, and how much mileage does it give?
The Altroz is one of the few hatchbacks still sold with a diesel engine. It has a claimed figure of 23.60 km/l, which makes it a good option if you cover long distances on the highway.
Q. Does CNG take away boot space in these cars?
Both the cars use a twin-cylinder setup under the boot floor. In the Altroz CNG, you still get about 210 litres of boot space.
Q. Does the new Tata Aeris use the same engine as the Tiago?
The Aeris, which replaced the Tigor in September 2026, is based on the Tiago and uses the same 1.2-litre petrol and CNG engines. Its mileage should be quite similar to the Tiago’s.
