For 6 months, Im guessing that would get me through 6-8 litres? At least that much before, maybe 5-6 now. Actually thinking about that now, it seems like it had a good amount of fuel through it, but Ive heard of engines lasting crap-loads longer! I hope maybe I just had a wrong tune, making me think the engine is dying, Ill definitely find out in the next 2 weeks to be sure.