Now I don't know for sure, I'm just pondering here... but I'm going to guess that the computer is pretty accurate - or at least *could* be pretty accurate. The amount of fuel injected is adjusted to get the correct engine parameters based on temperature, O2 output, etc. So if you have an injector that, let's say, dumping a little too much fuel then the computer will (or could) back that injector off a bit. So the measure of overall fuel usage would be based on how the nature of the actual combustion, not just an estimate of injector calibration. Now all of that is, of course, based on the accuracy of many sensors.
Again, I'm not sure it *is* that way, but the computers have enough smarts to do that. And of course if you're getting lousy mileage because you have a leak in your fuel tank, then measuring what goes is a better method... :-)
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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