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hi i have an 03 m3 and get about the same crap depending on how i drive. if i keep the shifts below 4000rpm and dont stopm the gas pedal or put it to full throttle at all, with 50% hwy driving i can get about 500km. But if i have fun with the car i get about the same as u. For some reason if i run any less than 94 octane SUNOCO and push the car my check engine light will turn on code reads cataletic converter, so i dont run less then 94.