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Directly - you tap one of your injector grounds and it measures how long your injectors are open. Combine that with a connection to the VSS and you have fuel used and distance. You have to calibrate it, but there's a table in the wiki that should get you very close to start with. 2-3 tanks should get you within 1%.
An MPGuino is actually the only accurate way to measure fuel used in lean burn engines (and possibly for those who use engine-off coasting too). OBD port based meters can't account for these things.
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