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 Towny Goes Plowing - by Anthony West (UK). I live in an area renowned for its rural beauty. Small fields with hedgerows and trees are common place, as are small hamlets with village greens and the odd duck pond complete with swans. The center of any village once the shop is closed is the old tavern. Rustic places with cheerful names like "The Griffin" "Red Lion" or "The Plough and Harrow" are found dotted around the country lanes all over the place. The warm glow of yellowish light can be seen for quite some distance at dusk, and
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