We should conserve the fuel, because the fuels are getting depleted, and the chance for the fuel in the future will be less.
Then, the future generations will suffer, with the lack of fuel.
If we didn't conserve the fuels, then, there won't be any re-accomplishment.

So, it is important to conserve it, as it takes millions of years for it's formation. 
How to conserve??
1.We can save fuel by maximizing the use of battery vehicles, and minimizing the use of polluting vehicles.
2.We may use CNG, instead of petrol and diesel.
3.Use of alternative fuels must be appreciated.
4.Fuels are precious and present in a limited account, so the conservation of fuels is essential. The government must make awareness.

Thank you.
Hope this will help you.

what r u thinking yrself drinka padu
sali tannaa
harami ki bachchi