What is the definition of Mileage Fluid?

"Mileage fluid" is like the cosmic lubricant for your car's odometer, but instead of oil, it's a fancy-sounding, potentially toxic, and often ridiculously expensive concoction meant to keep your miles per gallon number from plummeting. It's the unsung hero of your car's financial well-being, but also a potential magnet for health insurance claims due to its questionable safety record.

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Here's an edgy example: "I spent a year meticulously mapping my soul's journey across 5,432 miles on this mileage fluid that smelled suspiciously of burnt rubber and self-loathing."