i believe, with the trip computer, the light is 'ON', once the computer estimates that you only have 70km or less to go. the light will be turned on when the 'distance to empty' hits 70.
i rolled into the servo the other day with 1Km left on my distance until empty on the screen. When i filled up the bowser got to 58 litres and clicked out. So i still had approx 7 litres in the tank when it said i had 1 Km left...interesting.
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