Your Mileage May Vary Cav. [from The Standard Disclaimer Attached To EPA Mileage Ratings By American Car Manufacturers] 1.

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Your mileage may vary cav.

[from the standard disclaimer
attached to EPA mileage ratings by American car manufacturers] 1. A
ritual warning often found in Unix freeware distributions.
Translates roughly as "Hey, I tried to write this portably, but
who knows what'll happen on your system?" 2. More
generally, a qualifier attached to advice. "I find that sending
flowers works well, but your mileage may vary."

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