5 things to use as little fuel as possible;
* Use the highest gear the engine will pull without lugging, and get into it as soon as possible
* Use the smallest possible throttle opening you (and other traffic) can stand for acceleration, and as few revs as possible
* On the open road, do all that you can to conserve momentum. Never let yourself speed up and slow down constantly.
* Cars use the least L/km the slower they are driven. Even more reason to stick to the speed limit.
* Replace your air filter before it gets cruddy, to maximise engine efficiency
And if you really want to save on fuel costs, get the car converted to run on liquid LPG injection