I've found both the e90 and e87 OBCs to be pretty accurate. The previous three e46s weren't bad either but earlier threes were lousy being sometimes up to 20% out compared to brim to brim calculations.
Regards
Chris
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Previously: 2007 335D MSport E90 Le Mans Blue, 2004 330D A Sport Silver Grey, 2002 330D A Sport Saphire Black, 2001 320D SE Touring Titanium Silver, 1998 M3 Evo Techno Violet, 1996 328i Sport Montreal Blue, 1994 325i Coupe Red, 1989 325i Sport 2 door Dolphin Grey,1986 325i SE 4 door Lachs
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