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I know this is an old thread but just added MMO again since having a low tank 2 after my best. Came to the realization that I had MMO in my best tank. This is with my cruze and the drop was significant even with switch to non LRR tires. After fuel up I started watching fuel trims again. And I would run a steady -22 fuel trim for a stretch when normally it's around -2 to -8. As far as I know that isn't supposed to happen since my car isn't lan burn applicable... Any thoughts
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