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My current and MY99 foresters had them. The seem to come on with just under 10 litres left.A full fill-up gets me about 52-54 litres in from the light coming on.
only the 98 cars and above have them,its stupid I know.I have the 97 car without one and the petrol guage goes right down into the middle of the E before its nearly empty.so as a guide as long as you dont go below that it should be alright, unless yours is different again.