Some tips for all the owners from my experience for swift:
1.Keep the air filter clean.Get it cleaned on every wash.
2.Check the air pressure regularly. Best is 33 in front,30 in rear, but it depends on the road.If roads you use are not good then 30 in all.
3. Avoid fast acceleration.Accelerate slowly. Try to drive the car in the RPM range 1500-2500.Best economy top speed is 80-100.Try to drive in highest gear possible for a particular speed.
4.Use ZIC XQ oil. Change it after 7000 kms(first time change at 5000).
5.Change the plugs to Iridium IK20 or NGK IFR6J11.They give nice pick and improve fuel economy.
6.First time gear oil to be changed after 5000 Kms. For engine oil, i had changed after 1000, however it is upto you.Can change after 3000.
7.In the first 1500 kms(it is called running in period) drive slowly, not more than 100.Avoid hard braking. It will be good for engine life.
8. Get the service done at 5000 from suzuki delaers and get their service entry in the warranty service booklet(check if your dealer has given you).This will be needed for proof of warranty and service in case of any issue.
9. There is an AC air filter under the front glove box, get it cleaned on every 5000 Kms service(it can choke if not cleaned which reduces AC air into cabin). Also get the blower behind the filter cleaned.