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in u'r case, the oni thing I can think of is, when idling u'r rpm is higher coz want to reduce the mounting vibration, when gear engage its rpm is lower but less engine vibration, so the more u'r car idles, the more fuel consumption. I know this coz the same wit my dear + my tachometer reading is like that when idle & engage gear
Ya my mech did tell me that but I didnt know will drop that much LOL!
short of 20-30KM. He afraid he adjusted already no vibration but FC affected slightly.
So might try to adjust DIY and see to a level that I like. See the difference.