sounds to me like you should top up on fuel
Its only even come on before when the needle has gone into the red and i know there is still plenty in there. Are they prown to being fualty at all? or could it mean somthning else?
It depends how you are driving mate. If you have been driving slight more spirited than usual the fuel light will come on sooner. Does on mine anyway. Its not really a big issue really. Just make sure you have diesel in it. Put it down to being a renault.