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Message: <blockquote data-quote="Chrix" data-source="post: 677734" data-attributes="member: 20930">Tires play a role in fuel efficiency as well, although I cant say for sure how much it could contribute to increased/decreased in consumption.How often the highway increase in gradient also could effect your consumption, cuz you will need more throttle to accelerate up to speed. The remaining 20% of your driving could also take a toll, is it bad stop-go traffic in that 20% of non-highway driving?BTW, that spoiler increases drag <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /> That could be the culprit.My M52B25's consumption dropped thanks to increase in traffic congestion, I could go ~100KM for RM30 worth of fuel, now only 80+km. Traffic has worsen in KL, also reach my destination 10 minutes later than before.What was the symptom of the failing power window? Mine would not stop when it reaches the top & bottom of the frame.</blockquote>