We should conserve the fuel because, it is so important for running the vehicles, and also, these are present only in a limited amount. So, we should conserve it. 

How can we conserve fuels??
We could start using battery vehicles, instead of using the common polluting vehicles.
We could use CNG as a substitute for petrol or diesel, as it less-polluting.
Use of public transports such as buses should be increased, than using personal vehicles.
In such a way, we could conserve the fuels.
Fuels are precious and present in a limited account, so the conservation of fuels is essential. The government must make awareness.
We can make the people to realize that they are using the fuels in such a high rate, which will make them to conserve the fuel, and it will become as a habit.
1. By making awareness of the more and more consumption of the fuel.
2. By telling the causes.
3. By giving ads in televisions, etc...
Thus, one can make fuel conservation, A HABIT.

Nice answer Raj!!
but why did you write half in bold and half in normal font?
those in the normal font may relate for the question, but those in the bold font are for this question :)
We should conserve fuel because it is a natural substance and it is limited in the world. 
e can make fuel conservation as a habit by using less bike/car riding.If Child wants he plays a very major role in fuel conservation. if a child wants to go near to house he can go with there bicycle or by walking. 

we should use less bike riding and because of it we can conserve the fuel. if anyone wants to go far away from house he can use bike only if it is very urgent or very necessary otherwise we should use bicycle or while walking we get conserve lot of fuel. if this activity is perform by whole world then definitely fuel never ends. 

fuel is a natural source and it is limited so we should conserve it. we can conserve it in many ways like if signal shows red light so we should turn off the engine because it safes fuel. we can conserve fuel by driving slow because if we ride fast engine becomes hot and they want more fuel so we should use less accelerator while driving. we should try to drive in a cool time like in the evening or in night. by driving slow we can conserve fuel and use it for a longer time.

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