NEW DELHI: Maruti Suzuki lists the Alto K10 petrol engine at 50.4 kW, while the factory CNG version produces 41.7 kW in CNG mode and 49.8 kW when running on petrol. All share a published 998 cc capacity. The important detail is the fuel-mode label beside each output: the CNG car has separate ratings for the fuels it uses.
| Alto K10 powertrain or mode | Maximum power | Maximum torque |
|---|---|---|
| Petrol model, displayed AGS specification | 50.4 kW at 5,600 rpm | 91.1 Nm at 3,400 rpm |
| Factory CNG model in CNG mode | 41.7 kW at 5,300 rpm | 82.1 Nm at 3,400 rpm |
| Factory CNG model in petrol mode | 49.8 kW at 5,600 rpm | 91.1 Nm at 3,400 rpm |
The CNG label changes how the table is read
The official comparison examined for this article places an LXi (O) CNG against a VXi+ (O) AGS petrol version. Its engine rows distinguish K10C CNG from K10C. Both show 998 cc, but the CNG column then divides power and torque by operating fuel. Reading only the shared engine capacity hides the most relevant difference in those rows.
In particular, the CNG model does not inherit the petrol model's 50.4 kW rating merely because it can also run on petrol. Maruti gives it a petrol-mode rating of 49.8 kW. That small-looking distinction should be preserved in a specification comparison rather than rounded away or replaced with the number from the general Alto K10 overview.
The overview describes the Alto K10 engine as a K-Series Dual Jet, Dual VVT unit and prominently displays 50.4 kW. That is useful as a broad introduction to the petrol car. The fuel-specific detail lives in the variant comparison, which is the appropriate source when a reader wants to know what the factory CNG version produces.
Read the engine speed beside the output
The listed maximum power is accompanied by engine speed: 5,600 rpm for the petrol ratings and 5,300 rpm for CNG mode. These are operating points for the published maximum outputs. They are not an instruction to hold the engine at that speed in traffic, nor do they describe the power available at every point in the rev range.
Torque is set out in a different row. The factory CNG car is listed at 82.1 Nm in CNG mode and 91.1 Nm in petrol mode, both at 3,400 rpm. The petrol-only comparison car also lists 91.1 Nm at that engine speed. Keep the units attached: kW describes power, while Nm describes torque. They should not be presented as interchangeable scores.
The published table does not supply complete output curves. Consequently, the peak figures cannot establish how closely the versions respond at every road speed or with every load. An everyday driving impression needs a properly comparable drive; a technical table can establish the ratings without pretending to be that road test.
Fuel mode and gearbox are different choices
The displayed CNG car has a 5-speed manual transmission. The petrol comparison car has AGS, Maruti's Auto Gear Shift. In the full variant list, CNG appears as LXi (O) CNG and VXi (O) CNG, while AGS is listed on petrol VXi (O) and VXi+ (O). Do not read a general reference to Alto K10 automatic technology as confirmation of a CNG automatic.
That separation is useful when discussing city use. Changing the operating fuel in a factory CNG car is not the same operation as selecting a gear in the transmission. Likewise, a transmission label does not tell the reader which fuel-specific engine output applies. Start with the full variant name, then read the engine and gearbox rows together.
Maruti describes AGS on its overview as a convenience for driving in traffic. This article does not turn that description into a claim that either transmission is faster, more comfortable on every road or better for every driver. Those would require evidence beyond the specification rows opened here.
What the shared dimensions do establish
The displayed CNG and petrol columns both list 3,530 mm overall length, 1,490 mm width and a 2,380 mm wheelbase. The different engine-mode figures therefore should not be mistaken for evidence of a different body generation. At the same time, equal external dimensions do not establish equal luggage accommodation; the table leaves the CNG boot-space entry unspecified.
For the Alto K10, the useful distinction is therefore unusually specific: a shared capacity, a separate factory CNG designation and different outputs depending on the fuel in use. Keeping those labels intact avoids both overstating CNG-mode performance and understating the specification of the same car while it operates on petrol.
For the wider ownership picture, read our Alto K10 variant price guide, Alto K10 steering-recall check and Alto K10 SmartPlay Studio phone-management guide.
Official sources: Alto K10 fuel-specific engine and transmission table and Alto K10 engine and AGS overview.
