I wouldn't sweat it too much..burned about 1 quart every 3K miles..I drive at about 80-85mph though. Owner's manual says it's normal

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1982 300TD 210K miles ("The Replacement" aka "The Anvil") - SOLD
1979 300SD 245K miles (never ending project)
2007 Pinarello F3:13
1995 Ducati 916 (SOLD, sniff)
1999 Ducati 900SSie (SOLD)