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.
Hope this will help you.