| You can fill your diesel to the brim without any problem.
The 6 L "reserve" is part of the 54 L. I have been getting pretty good numbers on the range, up to 900 when driving with a full tank on the highway.
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2008 Mercedes-Benz B 200 
2005 smart fortwo cdi pulse cabriolet, loaded 
1966 Peugeot 404 Coupé Injection
1989 Peugeot 405 DL, 366,000 km
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