Fuel conservation means saving the fuel or conserving the fuel for future use. 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 switch off the engine, when not in use, or in traffic.
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.