Your Mileage May Vary
From Unofficial BOINC Wiki
A jargon term meaning you might have a different experience that that of another individual.
Derived from the standard commercial for all motor vehicles. Indicating that they test drove the car in such a way that the indicated number of miles per gallon of gasoline can only be obtained if you are being towed, downhill, by a truck with Mach-4 capability.
Also this term is used in places where there are lots of developed Open Source programs. Indicating to the experienced that they may have Source Code that works for the author, but the author will not guarantee that it will run on your system.
A programmer's "insider" joke.