How to increase the mileage of car & save petrol?

I guess driving at normal speed, not too fast or too slow, with proper gear changing can surely effect the mileage of your car.

A lot has already been mentioned..just to add to the list, use brakes only when necessary, switch gears only when required..too many shifts in gear causes huge petrol consumption. Also, switch off the car ignition when waiting in huge traffic at traffic posts.

You can enhance the fuel efficiency of any car by following these tips.
•    Maintain your vehicle.
•    Check tire pressure.
•    Change engine oil and air filter.
•    Replace faulty components.
Check the major components like engine and transmission and if you are facing the problems time and again, do get it replaced with new or used ones from reliable places like http://www.buyusedengine.com/used_engine.php and other similar ones.