My (KZJ95; 3.0l I4 turbodiesel) Land Cruiser is completely off its kilter with regards to this - the low fuel light comes on when there's 25 litres or so left -

My (KZJ95; 3.0l I4 turbodiesel) Land Cruiser is completely off its kilter with regards to this - the low fuel light comes on when there's 25 litres or so left - which, if you are on a paved road translates into some 250km/150mi. or so. In addition to the fuel pump's well-being there's also condensation - if your vehicle experiences large temperature swings, it makes sense to keep the tank reasonably topped up to minimise condensation and water build-up in the tank.