Yes, as Maruti Suzuki S-Presso has a petrol engine, it gets a timing chain. The timing chain is the necessary part of an internal combustion engine. It synchronizes the rotation of the crankshaft and the camshaft so that the engine's valves open and closes at the proper times during each cylinder's intake and exhaust strokes.
The ARAI claimed mileage of Maruti S Presso is 21 Kmpl. As far as the suspension is concerned, it has McPherson Strut in the front and Torsion Beam with Coil Spring in the rear. Moreover, you can have a test drive of the cars for a better idea of comfort and drive quality by visiting the nearest dealer in your city. You can click on the following link to see the details of the nearest dealership and selecting your city accordingly - Dealers.
For any modifications in the car, we would suggest you walk into the nearest service centres. You can click on the following link to see the details of the nearest service centres and selecting your city accordingly - Service centre.