Kia Sonet, the subcompact SUV was launched in 2020 in India. It’s in its first generation now and has good market value for affordable automatics. The Maruti Fronx is a subcompact SUV with a coupe styling and is known for powerful sporty engine. It is in its first generation and was released in 2023. In real-world scenarios, the Maruti Fronx has better mileage of 18.5 km/l on average, while the Kia Sonet has an average mileage of 16 km/l for its diesel manual variant.
Kia Sonet has two petrol variants and a diesel variant. It uses a Smartstream G1.2L naturally aspirated engine and a 1.0L turbo petrol engine. The diesel engine is a 1.5L CRDi engine that is more powerful. The Maruti Fronx uses K-series engines in its petrol and CNG variants. There is no diesel variant for Fronx. The CNG and petrol variants use a 1.2L K-series naturally aspirated dualjet engine. There is also a 1.0L Boosterjet turbo petrol engine. This article covers how these engines perform and what their fuel efficiency is. We assess fuel efficiency to estimate fuel costs for these models, so you have a clear picture.
Table of Contents
Kia Sonet vs Maruti Fronx Specs
The basic specifications such as the engine types, power, torque, transmission, etc., of the Kia Sonet and Maruti Fronx are given in the table below.
| Specification | Kia Sonet | Maruti Fronx |
| Engine | 1.2L NA Petrol1.0L Turbo Petrol1.5L CRDi Diesel | 1.2 L Dualjet Petrol1.0L Boosterjet Turbo Petrol1.2 L CNG |
| Displacement | Petrol: 1197 ccTurbo Petrol: 998 ccDiesel: 1493 cc | Petrol: 1197 ccTurbo: 1197 ccCNG: 998 cc |
| Power | Petrol: 82 PSTurbo: 119 PSDiesel: 115 PS | Petrol: 89.73 PSTurbo: 100.06 PS CNG: 77.5 PS |
| Torque | Petrol: 112 NmTurbo: 172 NmDiesel: 250 Nm | Petrol: 113 NmTurbo: 147.6 NmCNG: 98.5 Nm |
| Transmission | 5-speed MT 6-speed iMT 6-speed AT 7-speed DCT | 5-speed Manual5-speed AMT6-speed AT |
| Drive layout | 2WD | Front Wheel Drive |
| Kerb weight | Petrol: 1081 kgTurbo: 1100-1200 KgDiesel: 1233-1346 kg | Petrol MT: 960-970 KgPetrol AMT: 965-975 KgTurbo MT: 1015 – 1030 KgTurbo AT: 1055- 1060 kgCNG: 1050Kg – 1060 Kg |
| Fuel tank capacity | Petrol: 44 litres Diesel: 44 litres | Petrol: 37 litresCNG: 55L |
When you compare the engine power, Kia Sonet engines are more powerful and can deliver high torque, especially with its turbo and diesel engines. The petrol variants of the Maruti Fronx weigh less than the Kia Sonet variants. Its turbo and CNG variants have a similar weight, and the diesel variant of the Kia Sonet is much heavier. Their manual transmission has a 5-speed gearbox. Kia Sonet can give you more options with an iMT, automatic and a 7-speed DCT transmission. The Fronx has either a manual or a torque converter automatic gearbox.
Kia Sonet vs Maruti Fronx: ARAI Mileage Figures
The ARAI test by the Automotive Research Association of India is the best way to understand these engines’ potential. It is conducted under a strict and controlled environment, and the mileage of vehicles is estimated. This is the maximum mileage they can achieve under similar circumstances. The ARAI figures of Kia Sonet and Maruti Fronx can be seen in the table below.
| Engine & Transmission | Fuel Type | Kia Sonet – ARAI Mileage (km/l) | Maruti Fronx – ARAI Mileage (km/l) |
| 1.0L Turbo– 6iMT | Petrol | 18.3 km/l | — |
| 1.0L Turbo – 7DCT | Petrol | 18.3 km/l | — |
| 1.2L NA –5MT | Petrol | 18.4 km/l | — |
| 1.2L CRDi– 6MT | Diesel | 24.1 km/l | — |
| 1.2L CRDi– 6MT | Diesel | 19.0 km/l | — |
| 1.2 L Dualjet 5MT | Petrol | — | 21.79 Km/l |
| 1.2 L Dualjet 5AMT | Petrol | — | 22.89 Km/l |
| 1.0L Boosterjet Turbo 5MT | Petrol | — | 21.50 Km/l |
| 1.0L Boosterjet Turbo 6AT | Petrol | — | 20.01 Km/l |
| 1.2 L S-CNG 5MT | CNG | — | 28.51 Km/Kg |
As per ARAI claims, the Maruti Fronx is the better performer, with higher mileage for its dualjet manual petrol variant. For the Kia Sonet, the best performer is its diesel manual variant. Remember that these figures are what you get under controlled conditions and can be completely different from what you may get while driving in the real world.
Also Read: Maruti Fronx Mileage Comparison: Petrol vs CNG
Kia Sonet vs Maruti Fronx: Real-World Fuel Efficiency
When you drive a Kia Sonet or a Maruti Fronx, the mileage you get on city roads or highways indicates its real efficiency. In most cases, such mileage will be much lower than the ARAI claims. Let’s check them out.
| Kia Sonet (Petrol) | Maruti Fronx (Petrol) | |
| City | Manual: 12 to 13 km/lAutomatic: 11 to 13 km/l | Manual: 14 to 16 Km/lAutomatic: 13 to 15 Km/l |
| Highway | Manual: 16 to 18 km/lAutomatic: 15 to 17 km/l | Manual: 18 to 22 Km/lAutomatic: 17 to 20 Km/l |
| Average | Manual: 15 km/lAutomatic: 14 km/l | Manual: 15 km/lAutomatic:18.5 km/l |
| Tank range | 600-750 Km | 700 to 800 Km |
The real-world mileage of Sonet petrol variants on city roads is notably lower than the ARAI figures. But it can deliver a closer mileage on the highways. The highway mileage of the Fronx manual petrol variant is closer and sometimes can even be better.
| Kia Sonet (Diesel) | Maruti Fronx (CNG) | |
| City | MT: 16 to 18 km/lAMT: 14 to 16 km/l | 20-22 Km/Kg |
| Highway | MT: 21 to 23 km/lAMT: 18 to 20 km/l | 25-28 Km/Kg |
| Average | MT: 17 km/lAMT: 15 km/l | 24 Km/Kg |
| Tank range | 620 to 850 km | Combined 900-1000 Km |
The diesel manual variant of Kia Sonet delivers mileage that is close to its ARAI claims. The CNG variant of the Fronx shows higher performance and can deliver excellent mileage that is close to the ARAI, especially on highways.
Also Read: Kia Sonet Mileage Comparison: Petrol vs Diesel vs Turbo Petrol
Kia Sonet vs Maruti Fronx: Fuel Cost Comparison
The running cost of cars is a crucial factor that can help you decide whether or not to choose a particular model. Here is a comparison of the estimated fuel cost of Kia Sonet and Maruti Fronx variants. To get an idea of the expected cost, let’s assume their average mileage. Let’s also set the monthly distance traveled at 1500 km. We will take prices of petrol, diesel and CNG as Rs. 110, 100 and 90 respectively.
| Sonet Petrol | Fronx Petrol | Sonet Diesel | Fronx CNG | |
|---|---|---|---|---|
| Monthly Running | 1500 km | 1500 km | 1500 km | 1500 km |
| Monthly Fuel Use | 105 L | 96L | 95 L | 64 Kg |
| Avg. Monthly Fuel Cost | ₹ 11,550 | ₹ 10,656 | ₹ 9500 | ₹ 5440 |
| Average Yearly Fuel Cost | ₹ 1.38 lakhs | ₹ 1.27 lakhs | ₹ 1.14 lakhs | ₹ 65,280 |
| 5-Year Fuel Cost | ₹ 6.93 lakhs | ₹6.39 lakhs | ₹ 5.70 lakhs | ₹3.26 lakhs |
The Maruti Fronx CNG variants have the lowest fuel cost when compared with its other variants and the Kia Sonet. For the Sonet, its diesel variant would be the best option to save on fuel expenses. The petrol variant of the Sonet can be the most expensive, followed by the Fronx petrol variant. The Fronx CNG would cost you only half of what you would spend on the Sonet petrol variant. Over a period of 5 years, the CNG variant can save you nearly 3 lakhs.
Also Read: How to Increase Maruti Suzuki Fronx Mileage?
Kia Sonet vs Maruti Fronx Price
Just to have a look at the initial cost of Kia Sonet and Maruti Fronx, here is their price range.
| Model | Variant (Base to Top) | Price (Ex-Showroom) |
| Kia Sonet | HTE to X-Line | ₹ 7.40 lakhs to ₹ 13.79 lakhs |
| Maruti Fronx | Sigma to Alpha | ₹ 6.85 lakhs to 12.88 lakhs |
The Maruti Fronx has a lower initial cost than the Kia Sonet, and it also has a CNG option that will have a lower fuel cost.
Summary
In this comparison of fuel efficiency and fuel cost of the Kia Sonet and Maruti Fronx, the conclusion is that the Fronx will be a better option in terms of fuel cost. Both Sonet and Fronx can be fuel efficient on highways. On city roads, their mileage drops notably. This is reflected in their fuel cost. The Fronx CNG variant will be a good choice if you have a strict budget and want to watch how much you spend on fuel. If you want a petrol or diesel option, the Kia Sonet diesel will be a good choice. This diesel variant is also suitable for those looking for a powerful engine for frequent longer trips. For the petrol variants, Maruti Fronx is the best for real-world mileage. Its lighter weight helps with the higher fuel efficiency, even on city roads.
Related Reads:
Maruti Fronx vs Mahindra XUV300 Real World Mileage Comparison
Kia Sonet vs Mahindra XUV300 Real-World Mileage Comparison
Kia Sonet vs Renault Kiger Real-World Mileage Comparison
FAQs About Kia Sonet vs Maruti Fronx Mileage Comparison
Q. Which car would cost less to run over a 1500-km monthly commute?
If you have a higher monthly driving distance, then you can either choose the Maruti Fronx CNG or the Kia Sonet diesel variant. The CNG will cost you the least and the diesel variant is the second best. The CNG will cost you just around Rs. 5500 while the diesel costs around Rs. 10,000, per month. The petrol variants have a lesser fuel efficiency and have higher fuel charges so the monthly expenses will be much higher.
Q. How much mileage can the Kia Sonet deliver in everyday driving?
The daily driving in the city will have a 11-13 km/l for the Kia Sonet petrol variants. Its diesel variants will have a higher mileage in the city at around 16-18 km/l. If you drive on the highways, the average you can expect are 15-18 km/l for petrol variants and 18 to 23 km/l for diesel variants.
Q. How does the Fronx CNG perform when driven mainly in the city?
If your daily driving is mainly in and around the city, then Fronx CNG will be an excellent option. It has an expected mileage of 20-22 Km/Kg in the city. But, depending on the traffic and driving style, the mileage may be lower. It is a practical and highly economical option. At the same time you may not get much acceleration as it focuses more on fuel efficiency and a relaxed ride.
Q. Which car is better suited to buyers who drive mostly in the city, Kia Sonet of Maruti Fronx?
If you drive mostly in the city, then the better option is the Maruti Fronx. It can give you better mileage and has lower maintenance costs. Its turbo engine offers minimal lag at lower speeds and is easier in heavy traffic than the Sonet. Not only is it available at lower initial cost but also has easy access to service centers. If you want a more premium cabin feel, then Kia Sonet would be a better option.
Q. Which car offers more consistent mileage across different driving conditions, Fronx or Sonet?
Because of its lighter body and the refined naturally aspirated engine, the Maruti Fronx is the better option for constant mileage across different road conditions. This engine works fine on the highways and also in the stop-and-go traffic in the city. If you are choosing the Sonet, the diesel variant with the torque converter transmission is the better choice. It has good mileage and comes with plenty of features inside.
