The Kia Sonet and the Mahindra XUV 3XO are two of the most feature-rich compact SUVs in India, and both offer a choice of petrol, turbo-petrol and diesel engines. The Sonet pairs a 1.2-litre naturally aspirated petrol, a 1.0-litre turbo-petrol and a 1.5-litre diesel with a wide range of gearboxes, while the XUV 3XO offers two 1.2-litre turbo-petrol engines, a 1.5-litre turbo-diesel and, since October 2026, a factory-fitted CNG option.
So, Sonet or XUV 3XO, which is better for mileage? In this Kia Sonet vs Mahindra XUV 3XO comparison, we look at ARAI-claimed and real-world mileage for each powertrain, along with specs, fuel costs and price, to help you decide.
Kia Sonet vs Mahindra XUV 3XO Specs | Kia Sonet vs Mahindra XUV 3XO: ARAI Claimed Mileage | Kia Sonet vs Mahindra XUV 3XO: Real-World Mileage | Kia Sonet vs Mahindra XUV 3XO: Fuel-Cost Comparison | Kia Sonet vs Mahindra XUV 3XO Price | Summary | FAQs
Table of Contents
Kia Sonet vs Mahindra XUV 3XO Specs
The specifications of the Kia Sonet and the Mahindra XUV 3XO help explain the difference in their mileage. The table below sheds some light on this:
| Specification | Kia Sonet | Mahindra XUV 3XO |
|---|---|---|
| Engine | 1.2-litre Smartstream NA petrol / 1.0-litre Smartstream T-GDi turbo-petrol / 1.5-litre CRDi VGT diesel | 1.2-litre mStallion TCMPFi turbo-petrol / 1.2-litre mStallion TGDi turbo-petrol / 1.5-litre turbo-diesel (CRDe) / 1.2-litre TCMPFi CNG (ZNG) |
| Power | 1.2 petrol: 61 kW (83 PS) / 1.0 turbo: 88 kW (120 PS) / Diesel: 85 kW (116 PS) | TCMPFi: 82 kW (111 PS) / TGDi: 96 kW (130 PS) / Diesel: 85.8 kW (117 PS) / CNG: 82 kW |
| Torque | 1.2 petrol: 115 Nm / 1.0 turbo: 172 Nm / Diesel: 250 Nm | TCMPFi: 200 Nm / TGDi: 230 Nm / Diesel: 300 Nm / CNG: 200 Nm |
| Transmission | 1.2 petrol: 5-speed MT / 1.0 turbo: 6-speed iMT, 7-speed DCT / Diesel: 6-speed MT, 6-speed iMT, 6-speed AT | Petrol: 6-speed MT, 6-speed AT / Diesel: 6-speed MT, 6-speed AutoSHIFT+ (AMT) |
| Fuel tank capacity | 45 litres | 42 litres (petrol) / 60 litres water-equivalent (CNG) |
| Boot space | 385 litres | 364 litres |
The XUV 3XO has the stronger engines on paper, with up to 130 PS from its TGDi turbo-petrol and 300 Nm of torque from its diesel. The Sonet counters with more gearbox choices, including iMT options for both its turbo-petrol and diesel, a larger 45-litre fuel tank and a bigger boot. Let’s see the ARAI-claimed mileage figures of both these cars now.
Kia Sonet vs Mahindra XUV 3XO: ARAI Claimed Mileage
ARAI mileage figures are usually higher than real-world mileage because the tests are carried out in a controlled environment under ideal conditions. Still, they are a useful benchmark for comparing cars. The claimed mileage of the Kia Sonet and Mahindra XUV 3XO is given below:
| Engine & Transmission | Fuel Type | Kia Sonet – ARAI Mileage | Mahindra XUV 3XO – ARAI Mileage |
|---|---|---|---|
| 1.2L NA Petrol – 5-Speed MT | Petrol | 18.83 km/l | NA |
| 1.0L Turbo-Petrol – 6-Speed iMT | Petrol | 18.7 km/l | NA |
| 1.0L Turbo-Petrol – 7-Speed DCT | Petrol | 19.2 km/l | NA |
| 1.2L TCMPFi Turbo-Petrol – 6-Speed MT | Petrol | NA | 18.89 km/l |
| 1.2L TCMPFi Turbo-Petrol – 6-Speed AT | Petrol | NA | 17.96 km/l |
| 1.2L TGDi Turbo-Petrol – 6-Speed MT | Petrol | NA | 20.1 km/l |
| 1.2L TGDi Turbo-Petrol – 6-Speed AT | Petrol | NA | 18.2 km/l |
| 1.5L Diesel – 6-Speed MT | Diesel | 24.1 km/l | 20.6 km/l |
| 1.5L Diesel – 6-Speed iMT | Diesel | 22.3 km/l | NA |
| 1.5L Diesel – 6-Speed AT / AutoSHIFT+ | Diesel | 18.6 km/l (AT) | 21.2 km/l (AutoSHIFT+) |
| 1.2L TCMPFi CNG (ZNG) | CNG | NA | 24.7 km/kg |
Among petrol models, the XUV 3XO TGDi manual claims the highest figure at 20.1 km/l, ahead of the Sonet turbo DCT’s 19.2 km/l. The Sonet’s 1.2-litre petrol (18.83 km/l) and the XUV 3XO’s TCMPFi manual (18.89 km/l) are almost level. In diesel form, the Sonet manual leads with a claimed 24.1 km/l, while the XUV 3XO diesel automatic (21.2 km/l) is well ahead of the Sonet diesel automatic (18.6 km/l). The XUV 3XO also offers a factory-fitted CNG option rated at 24.7 km/kg, which the Sonet does not.
Also Read: Complete Guide to Buying a Kia Sonet
Kia Sonet vs Mahindra XUV 3XO: Real-World Mileage
Now, let’s see whether the claimed figures translate into real-world mileage. The real-world mileage for each powertrain of the Sonet and the XUV 3XO is given below:
Kia Sonet (1.2L NA Petrol) vs Mahindra XUV 3XO (1.2L TCMPFi Turbo-Petrol)
| Driving Condition | Kia Sonet (1.2L Petrol) | Mahindra XUV 3XO (1.2L TCMPFi) |
|---|---|---|
| City | Manual: varies | Manual: 12–15 km/l / Automatic: 10–13 km/l |
| Highway | Manual: varies | Manual: 16–18 km/l / Automatic: 15–17 km/l |
| Average | Manual: 16.18 km/l | Manual: 15.25 km/l / Automatic: 13.75 km/l |
| Tank Range | About 728 km | 580–640 km |
Kia Sonet (1.0L Turbo-Petrol) vs Mahindra XUV 3XO (1.2L TGDi Turbo-Petrol)
| Driving Condition | Kia Sonet (1.0L Turbo) | Mahindra XUV 3XO (1.2L TGDi) |
|---|---|---|
| City | iMT: 11.2 km/l / DCT: 11.6 km/l | Manual: 13–16 km/l / Automatic: 11–14 km/l |
| Highway | iMT: 15.8 km/l / DCT: 16.5 km/l | Manual: 17–20 km/l / Automatic: 16–18 km/l |
| Average | iMT: 13.50 km/l / DCT: 14.05 km/l | Manual: 16.50 km/l / Automatic: 14.75 km/l |
| Tank Range | 605–630 km | 620–695 km |
Kia Sonet (1.5L Diesel) vs Mahindra XUV 3XO (1.5L Diesel)
| Driving Condition | Kia Sonet (1.5L Diesel) | Mahindra XUV 3XO (1.5L Diesel) |
|---|---|---|
| City | Manual: 15.4 km/l / Automatic: 13.8 km/l | Manual: 15–18 km/l / AutoSHIFT+: 16–19 km/l |
| Highway | Manual: 20.8 km/l / Automatic: 18.8 km/l | Manual: 19–21 km/l / AutoSHIFT+: 20–22 km/l |
| Average | Manual: 18.10 km/l / Automatic: 16.30 km/l | Manual: 18.25 km/l / AutoSHIFT+: 19.25 km/l |
| Tank Range | 730–815 km | 765–810 km |
With naturally aspirated and entry turbo petrol engines, the Sonet 1.2 manual averages about 16.18 km/l, slightly ahead of the XUV 3XO TCMPFi manual’s 15.25 km/l. Among the stronger turbo-petrols, the XUV 3XO TGDi is more efficient, averaging 16.50 km/l with the manual against the Sonet turbo iMT’s 13.50 km/l. For automatic buyers, the XUV 3XO TGDi AT (14.75 km/l) and the Sonet turbo DCT (14.05 km/l) are closely matched.
In diesel form, the manuals are almost level in real-world driving (18.10 vs 18.25 km/l), despite the Sonet’s much higher claimed figure. The XUV 3XO diesel AutoSHIFT+ is the most efficient automatic in this comparison at about 19.25 km/l, compared with 16.30 km/l for the Sonet diesel automatic. The XUV 3XO CNG was launched in October 2026, so reliable real-world figures are not yet available.
Also Read: Mahindra XUV 3XO Real World Mileage
Kia Sonet vs Mahindra XUV 3XO: Fuel-Cost Comparison
The monthly, yearly and 5-year fuel costs of the Sonet and the XUV 3XO show how their real-world mileage affects running costs. For reference, we have assumed that both cars run 1,500 km per month. Delhi fuel prices as of 26 October 2026, petrol (₹102.12 per litre) and diesel (₹95.20 per litre), are used to calculate the fuel costs:
| Cost Head | Sonet 1.2 Petrol MT | XUV 3XO 1.2 TCMPFi MT | Sonet 1.5 Diesel MT | XUV 3XO 1.5 Diesel MT |
|---|---|---|---|---|
| Monthly Running | 1,500 km | 1,500 km | 1,500 km | 1,500 km |
| Real-World Avg Efficiency | 16.18 km/l | 15.25 km/l | 18.10 km/l | 18.25 km/l |
| Monthly Fuel Use | 92.7 L | 98.4 L | 82.9 L | 82.2 L |
| Average Monthly Cost | ₹9,467 | ₹10,045 | ₹7,890 | ₹7,825 |
| Average Yearly Cost | ₹1.14 lakh | ₹1.21 lakh | ₹94,674 | ₹93,896 |
| 5-Year Fuel Cost | ₹5.68 lakh | ₹6.03 lakh | ₹4.73 lakh | ₹4.69 lakh |
Among petrol manuals, the Sonet 1.2 is the cheaper car to run, saving about ₹35,000 over five years compared with the XUV 3XO TCMPFi. The diesel manuals are virtually identical, with a difference of under ₹4,000 over five years. Either diesel is the better choice for high-mileage users, saving roughly ₹95,000–₹1.3 lakh over five years compared with the petrol manuals. Fuel prices vary by city, so recalculate using your local rates.
Kia Sonet vs Mahindra XUV 3XO Price
Let’s compare the ex-showroom prices of the Kia Sonet and the Mahindra XUV 3XO:
| Model | Variant (Base to Top) | Price (Ex-Showroom) |
|---|---|---|
| Kia Sonet | HTE to X-Line | From ₹7.45 lakh (X-Line from ₹13.89 lakh) |
| Mahindra XUV 3XO | MX1 to AX7L | ₹7.79 lakh to ₹15.04 lakh |
| Mahindra XUV 3XO CNG (ZNG) | MX Edge to REVX A | ₹9.99 lakh to ₹12.27 lakh |
The Sonet starts about ₹34,000 lower than the XUV 3XO. Both SUVs climb to well-equipped top trims, with the Sonet’s X-Line and GTX+ offering ADAS Level 1, ventilated seats and a BOSE sound system. The XUV 3XO variant line-up adds more powerful engines and a factory-fitted CNG option.
Also Read: Complete Guide to Buying a Mahindra XUV 3XO
Summary
When we compare the Sonet and the XUV 3XO across powertrains, neither SUV wins every round. The Sonet 1.2 petrol is the more efficient entry-level petrol, while the XUV 3XO TGDi is the more efficient turbo-petrol choice.
The diesel manuals of both SUVs deliver almost identical real-world mileage and running costs. If you want a diesel automatic, the XUV 3XO AutoSHIFT+ is clearly more efficient than the Sonet’s torque-converter automatic. The new XUV 3XO CNG adds another low-running-cost option, though its real-world mileage is yet to be established.
Therefore, if you want a lower starting price, more gearbox choices and a bigger boot, the Sonet is a great choice. If you want more power, a frugal diesel automatic or a factory-fitted CNG option, the XUV 3XO is worth the slightly higher price.
FAQs
Q. Which has better mileage, the Kia Sonet or the Mahindra XUV 3XO?
It depends on the powertrain. The Sonet 1.2 petrol is more efficient than the XUV 3XO TCMPFi petrol, while the XUV 3XO TGDi beats the Sonet turbo-petrol. Their diesel manuals deliver almost identical real-world mileage of around 18 km/l.
Q. What is the ARAI mileage of the Kia Sonet?
The Sonet claims 18.83 km/l with the 1.2 petrol MT, 18.7 km/l (iMT) and 19.2 km/l (DCT) with the 1.0 turbo-petrol, and 24.1 km/l (MT), 22.3 km/l (iMT) and 18.6 km/l (AT) with the 1.5 diesel.
Q. What is the ARAI mileage of the Mahindra XUV 3XO?
The XUV 3XO claims 18.89 km/l (MT) and 17.96 km/l (AT) with the TCMPFi petrol, 20.1 km/l (MT) and 18.2 km/l (AT) with the TGDi petrol, 20.6 km/l (MT) and 21.2 km/l (AutoSHIFT+) with the diesel, and 24.7 km/kg with CNG.
Q. Which diesel automatic is more fuel-efficient?
The XUV 3XO diesel AutoSHIFT+ is more efficient, with a claimed 21.2 km/l and about 19.25 km/l in real-world driving. The Sonet diesel automatic claims 18.6 km/l and averages about 16.30 km/l in real-world use.
Q. Does the Kia Sonet come with a CNG option?
No. The Sonet is offered with petrol, turbo-petrol and diesel engines only. The XUV 3XO is available with a factory-fitted CNG option (ZNG) from ₹9.99 lakh (ex-showroom).
Q. What is the fuel tank capacity of the Sonet and the XUV 3XO?
The Sonet has a 45-litre fuel tank, while the XUV 3XO petrol has a 42-litre tank. The XUV 3XO CNG has a 60-litre (water-equivalent) CNG capacity.
Q. Which is cheaper to run, the Sonet or the XUV 3XO?
Among petrol manuals, the Sonet 1.2 is cheaper at about ₹9,467 a month for 1,500 km, against ₹10,045 for the XUV 3XO TCMPFi. The diesel manuals cost almost the same, at around ₹7,800–₹7,900 a month at Delhi prices.
