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The OG Fuel was obtainable in Season 21: "Rewind" by being in the top 2% when the season ended.
OG Fuel's current MU count is at ~472, which is similar to most other uncommon items (such as White Marble or Blueportal), and even lower than some uncommon items (such as Sawblade rim which is at ~552), despite OG Fuel being at common.