In Autocar India’s real-world tests, the Skoda Slavia 1.0-litre petrol manual delivers an overall mileage of 13kpl (combined city and highway), while the automatic returns 11.95kpl. The manual is more efficient because it has a direct mechanical connection between the engine and the wheels, whereas the automatic uses a torque converter, which, by nature, has some energy losses due to fluid coupling, especially in stop-start urban conditions.
The Kia Sonet 1.0-litre turbo-petrol delivers 13.5kpl in manual form and 14.05kpl with the DCT (dual-clutch automatic). The 1.5-litre diesel is more efficient, giving 17.1kpl for the manual and 16.3kpl for the automatic. The diesel Sonet is not only frugal but also surprisingly enjoyable to drive. It has a smooth and refined 6-speed torque converter automatic, which complements the diesel engine’s strong torque delivery well.
If fuel efficiency is a top priority, the Sonet diesel is the better option. It’s also well-equipped and has a good-quality interior. However, the Slavia is in a different league when it comes to space, comfort, and overall driving experience. It rides better, feels more planted at high speeds, and offers a more premium feel with strong performance and good safety credentials. That said, turbo-petrol engines like the Slavia’s are sensitive to driving style—drive it hard, and the fuel economy can drop quickly.
Based on your monthly running of 1,000 to 1,500km, a diesel Sonet makes a lot of practical sense. But if you’re looking for a bigger, more comfortable car with a more engaging driving experience, the Slavia is still a compelling option—just be ready for slightly higher fuel bills.
Hope this helps you make an informed choice.

