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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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