Originally referring to fuel efficiency differences between drivers, now used broadly to indicate that personal experiences or results may differ from what's described or expected.
This phrase originated in 1970s automotive advertising following EPA fuel economy regulations that required mileage disclaimers. It quickly expanded beyond cars into general usage as a way to acknowledge individual variation in any experience.
YMMV (its internet abbreviation) has become one of the most useful phrases in our personalized world - it acknowledges that despite our desire for universal truths, individual experience reigns supreme. It's become the diplomatic way to share advice while respecting others' different circumstances.
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