I think you get 15 litres extra. But in the grand scheme of things, that's easily another 250km minimum on an already 1,000km tank.
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Current car: 2017 BMW G30 520d M-Sport, BMW F46 218d Grand Tourer
Previous cars: 1989 BMW E30 316i, 1998 BMW E36 323i Coupe M Sport, 2009 BMW E87 116d, 2013 BMW F31 320d M-Sport
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