But when you have already decided the blend of fuel you want to use for your car's engine, it's also important to make sure that the fuel you have selected is working properly or in other words, easily tunes your car. If it doesn't do that or if for some reason there are problems in running your car, don't even think twice in changing the fuel.
On with what should be done for nitro fuels. It's advisable to always keep the fuel in lock tight containers. A good explanation for this is evaporation. The reason is because when the air gets in the container, it'll cause evaporation or condensation which could ruin the fuel. When this happens, the damage on your engine's car could cause you your exhaust systems since the engine will run too hot.
Also, avoid storing your fuel in a room where temperature varies almost constantly. This will still damage the fuel and since it's advisable to maintain the normal state of your fuel, be sure that it doesn't shift to hot and then cold and hot again every other hour when it comes to room temperature.
Another factor important for fuel storage is the light. You have to make sure that you keep your fuel away from the light. If you expose your fuel to direct sunlight or in a bright room, the nitro methane ingredient in the fuel will degrade and this will cause poor running condition of your RC car later on when put in use. Be sure that you keep the fuel in a cool, dark place with stable temperature.
And of course, when you have been keeping fuel for more than a year or more than a year, it's better to dispose it. Using fuel kept for an indefinite time may cause harm to your car's engine and the guarantees offered by manufacturers would have surely lapsed already so there's no point in keeping an old fuel. Make sure you replace yours regularly.