Tata Altroz CNG’s mileage is widely claimed to be 27.8 km/kg, while the Toyota Glanza CNG is certified for 30.61 km/kg. Both vehicles are hatchbacks, with the Tata Altroz launched in the year 2020 with its facelift occurring in the year 2025, while Toyota Glanza came in the market in 2019 and has its current generation introduced in 2022. Tata Altroz provides petrol, diesel, and CNG engines with both manual and automatic transmission options, while Toyota Glanza is being offered with petrol in either manual or AMT form and CNG in manual form.
The claimed CNG figures give the Glanza a head start on paper, but they cannot tell you what either car will return in traffic or on a highway trip. Petrol buyers also have different gearboxes to consider, while the Altroz adds a diesel option that the Glanza does not offer. Those choices affect both mileage and the amount you spend at the pump.
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Tata Altroz vs Toyota Glanza Specs
For petrol buyers, both vehicles are fitted with naturally aspirated engines that have a capacity of 1.2 litres, with the Altroz having three cylinders, while the Glanza has four. The Glanza is lighter as Toyota states that it falls in the range of 920–955 kg for its petrol manual version, while the published figures for the Altroz petrol-manual start at around 1,036 kg. The weight of the vehicle varies according to the variant.
Their automatic choices are different. The Glanza uses a five-speed AMT; the Altroz offers a five-speed AMT and six-speed DCA. Tata also sells a 1.5-litre diesel manual, which Toyota cannot match. Both offer CNG, but only the Altroz offers a CNG AMT. All drive the front wheels and have a 37-litre petrol tank. CNG cylinder capacities are water-equivalent volumes, not kilograms of gas.
| Specification | Tata Altroz | Toyota Glanza |
| Petrol engine | 1.2-litre, three-cylinder | 1.2-litre, four-cylinder |
| Petrol displacement | 1,199 cc | 1,197 cc |
| Petrol power | 88 PS | About 90 PS |
| Petrol torque | 115 Nm | 113 Nm |
| Petrol transmission | Five-speed manual, five-speed AMT or six-speed DCA | Five-speed manual or AMT |
| Other fuel options | 1.5 diesel manual; 1.2 CNG manual or AMT | 1.2 CNG manual |
| Drive layout | Front-wheel drive | Front-wheel drive |
| Kerb weight | Around 1,036 kg for a listed petrol manual; varies by trim | 920–955 kg petrol manual; varies by trim |
| Petrol tank capacity | 37 litres | 37 litres |
The more relevant comparison is a tested Altroz automatic against a tested Glanza automatic, then CNG manual against CNG manual.
Tata Altroz vs Toyota Glanza ARAI Mileage Figures
According to Toyota, the Glanza’s petrol manual mileage is 22.35 km/l, while that of the petrol AMT is 22.94 km/l. The mileage of the CNG manual is reported to be 30.61 km/kg. The Altroz has a claimed mileage of 19.33 km/l for petrol, 23.64 km/l for diesel, and 27.8 km/kg for CNG. The 19.33 km/l petrol, 23.64 km/l diesel, and 27.8 km/kg CNG figures need to be treated with extra caution. Some databases have carried the earlier variant mileage figures for the Altroz.
The table therefore distinguishes Toyota’s current brochure claims from Altroz figures listed by automotive databases. It does not attach the older 19.33 km/l petrol number to the newer AMT or DCA as though both were freshly certified. Tata’s CNG AMT was introduced after the CNG manual road test used later; its manual mileage and test result should not be treated as figures for the automatic.
| Car | Engine & transmission | Fuel type | ARAI mileage |
| Tata Altroz | 1.2 petrol, manual | Petrol | 19.33 km/l, commonly listed; confirm for facelift |
| Tata Altroz | 1.2 petrol, AMT | Petrol | Current variant figure not verified |
| Tata Altroz | 1.2 petrol, DCA | Petrol | Current variant figure not verified |
| Tata Altroz | 1.5 diesel, manual | Diesel | 23.64 km/l, commonly listed; confirm for facelift |
| Tata Altroz | 1.2 CNG, manual | CNG | 27.8 km/kg, commonly listed |
| Tata Altroz | 1.2 CNG, AMT | CNG | Current variant figure not verified |
| Toyota Glanza | 1.2 petrol, manual | Petrol | 22.35 km/l |
| Toyota Glanza | 1.2 petrol, AMT | Petrol | 22.94 km/l |
| Toyota Glanza | 1.2 CNG, manual | CNG | 30.61 km/kg |
On the published claims, the Glanza leads the listed petrol-manual and CNG-manual pairings. Road tests better indicate actual consumption.
Also Read: Tata Altroz Mileage Comparison: Petrol vs CNG vs Diesel
Tata Altroz vs Toyota Glanza Real-World Fuel Efficiency
According to the reports, the Tata Altroz petrol DCA facelift has achieved a mileage figure of 10.45 km/l in city conditions and 18.36 km/l on the highway. Meanwhile, the Glanza road test reveals a mileage figure of 17.34 km/l in the city and 22.63 km/l on the highway for the petrol AMT vehicle. Although the road tests were completed on different dates and were not performed in a controlled environment, the large difference between the fuel economies of the two vehicles cannot be ignored.
For CNG, the Altroz manual is measured at 19.80 km/kg city and 34.58 km/kg highway. A comparable published city-and-highway test of the Glanza CNG was unavailable. Its roughly 22 km/kg owner-reported figure is useful as a rough planning value, but it cannot establish which CNG car wins a controlled road test. The Altroz diesel returned 17.6 km/l over an independent mixed drive with hills, air conditioning and a long idle period; that is not a separate city or highway result.
| Petrol automatics | Altroz 1.2 DCA | Glanza 1.2 AMT |
| City | 10.45 km/l | 17.34 km/l |
| Highway | 18.36 km/l | 22.23 km/l |
| Average, calculated 50:50 | 13.32 km/l | 19.48 km/l |
| Tank range, theoretical | About 493 km | About 721 km |
| Other fuel options | Altroz CNG manual | Glanza CNG manual | Altroz diesel manual |
| City | 19.80 km/kg | Not independently tested | Not separately tested |
| Highway | 34.58 km/kg | Not independently tested | Not separately tested |
| Average | 25.18 km/kg, calculated 50:50 | About 22 km/kg, owner reported | 17.6 km/l, separate mixed drive |
| Tank range | Depends on gas fill | Depends on gas fill | About 651 km, theoretical |
The 50:50 averages take into consideration equal distance travelled in city driving and highway driving. It is a sum of total distance driven divided by the litres or kg of gas consumed in the two parts. In addition, CNG water capacity cannot be multiplied by the km per kg to estimate the range, as the amount of gas used depends on the pressure at the gas station.
A Glanza petrol manual also returned 17.52 km/l city and 22.30 km/l highway in some tests, which works out to 19.62 km/l for the same 50:50 calculation. Its manual and petrol AMT may deliver different figures from the DCA, so a buyer choosing either gearbox should not use the DCA cost estimate as a guaranteed result.
Tata Altroz vs Toyota Glanza Fuel Cost Comparison
Assuming a monthly distance of 1,500 km and an equal split of distance in the city and highway as far as both the figures have been separately tested, petrol rates in Pune as of 28 September 2026 are ₹111.90/litre, diesel ₹98.55/litre, and MNGL’s Pune CNG price ₹97.75/kg. Calculations for automatic petrol and Altroz CNG take the 50:50 results above, rather than the ARAI figures, while diesel uses the separately measured mixed run figure. Glanza CNG is based on an owner-reported average.
| Petrol automatics | Altroz 1.2 DCA | Glanza 1.2 AMT |
| Monthly running | 1,500 km | 1,500 km |
| Mileage used | 13.32 km/l | 19.48 km/l |
| Monthly fuel use | 112.6 litres | 77.0 litres |
| Average monthly fuel cost | ₹12,602 | ₹8,615 |
| Average yearly fuel cost | ₹1,51,226 | ₹1,03,383 |
| Five-year fuel cost | ₹7,56,131 | ₹5,16,916 |
| Other fuel options | Altroz CNG manual | Glanza CNG manual | Altroz diesel manual |
| Monthly running | 1,500 km | 1,500 km | 1,500 km |
| Mileage used | 25.18 km/kg, calculated | About 22 km/kg, owner reported | 17.6 km/l, mixed test |
| Monthly fuel use | 59.6 kg | 68.2 kg | 85.2 litres |
| Average monthly fuel cost | ₹5,823 | ₹6,665 | ₹8,399 |
| Average yearly fuel cost | ₹69,873 | ₹79,977 | ₹1,00,790 |
| Five-year fuel cost | ₹3,49,364 | ₹3,99,886 | ₹5,03,949 |
At this distance, the Glanza AMT consumes approximately ₹47,843 less petrol every year compared to the Altroz DCA used for comparison. In the price comparison of the models, the S AMT variant is also priced lower than the Altroz Creative S DCA. The comparison refers to fuel consumption only in the actual tests carried out, and does not account for other forms of the Altroz automatic.
For the Glanza S, choosing CNG over its petrol manual adds approximately ₹86,000 ex-showroom. Using the tested manual petrol average of 19.62 km/l and the owner-reported CNG estimate of 22 km/kg gives roughly ₹22,667 in annual fuel savings: an indicative fuel-only break-even of 3.8 years, or 68,000 km. Because the CNG number is owner-reported rather than a matched test, do not treat that as a promised payback. Servicing, taxes, insurance and petrol used before switching to CNG are excluded.
Also Read: Tata Altroz Alternatives: Competitors of Tata Altroz
Tata Altroz vs Toyota Glanza Price
The ex-showroom price list for September 2026 reflects the different variants relevant to the comparison. The Altroz Creative S DCA does not belong to the same trim as the Glanza S AMT; their sticker price difference does not reflect the cost of just one automatic transmission. On-road prices as well as dealer offers will depend on various geographical locations.
| Model | Variant | Price (ex-showroom) |
| Tata Altroz | Pure petrol manual | ₹7.15 lakh |
| Toyota Glanza | S petrol manual | ₹7.63 lakh |
| Toyota Glanza | S petrol AMT | ₹8.28 lakh |
| Tata Altroz | Pure CNG manual | ₹8.20 lakh |
| Toyota Glanza | S CNG manual | ₹8.49 lakh |
| Tata Altroz | Pure diesel manual | ₹8.30 lakh |
| Tata Altroz | Creative S petrol DCA | ₹9.65 lakh |
The Altroz Pure CNG is about ₹29,000 cheaper than the Glanza S CNG at these listed prices, but their equipment differs, and the CNG mileage evidence is not like-for-like. Tata also offers CNG AMT models, starting above the manual, if an automatic and gas fuel are both priorities.
Summary
The Toyota Glanza AMT is a winner in this real-world mileage comparison. It delivers 19.48 km/l of mileage as observed while travelling equal distances in the city and on the highway. The Altroz DCA under test provides 13.32 km/l.In this case, the estimated fuel expenditure for a buyer operating one of these cars would be lower at a distance of 1,500 km.
The CNG result needs a shorter answer. The Altroz CNG manual returned a calculated 25.18 km/kg in a road test, while the available Glanza CNG figure is an owner-reported average, not a matched city-and-highway test. The Altroz diesel offers another option for frequent longer trips, without a Glanza diesel counterpart.
Also Read: Tata Altroz Running Cost Breakdown: 5-Year Service Cost, Fuel Cost
FAQs
Q. Which has better petrol mileage, the Altroz or Glanza?
In the cited automatic road tests, the Glanza AMT leads the Altroz DCA in both city and highway driving. A calculated equal-distance mix gives 19.48 km/l against 13.32 km/l. The Altroz petrol manual and AMT need their own measured tests before extending that exact gap to them.
Q. Does the Glanza CNG beat the Altroz CNG in real-world mileage?
Toyota claims 30.61 km/kg, while 27.8 km/kg is widely listed for the Altroz CNG manual. The Altroz returned 19.80 km/kg city and 34.58 km/kg highway in one published test. There is no comparable Glanza CNG test here, so a tested winner cannot be named.
Q. Is the Altroz diesel cheaper to fuel than the petrol Glanza?
It could be, but the available diesel result comes from a separate mixed drive that included extended idling. Using it gives about ₹8,399 monthly at the stated Pune rate. That result cannot establish a reliable saving against a separately tested Glanza.
Q. Can I get an automatic Altroz CNG?
Yes. Tata added a five-speed AMT to its CNG lineup in May 2026. The 19.80 km/kg city and 34.58 km/kg highway figures in this article were measured in the CNG manual; they should not be assigned to the newer automatic without a test.
Q. Why is the CNG range missing from the table?
A cylinder’s 55- or 60-litre water capacity is not the mass of CNG it will hold. The kilograms delivered vary with filling pressure and temperature. Multiplying water capacity by km/kg would create a misleading range estimate, so only liquid-fuel theoretical ranges are shown.
Q. How long will a Glanza S CNG take to repay its premium over the S petrol?
On the stated mileage, prices and fuel rates, about 3.8 years or 68,000 km through fuel savings alone. That estimate combines a petrol road test with owner-reported CNG mileage, so your own refuelling records may produce a different result.
