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 - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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