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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