Quote:
Originally posted by youbetcha
Very interesting -- the formula ssumes that the engine is only run rich or lean for small enough amounts of time that MPG isn't affected. Your conclusion about the airflow not going through cylinders, thus not affecting the calculation, makes sense, too. Thanks.
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I would say so. It's reasonably accurate to calculate it this way. If you want true MPG, you'd have to measure fuel flow, but in most engine management systems, there's no "fuel flow" sensor, but there's an air flow sensor. Making the leap that you're pulling in air and that you're burning at near-perfect efficiency, it stands to reason that then you can apply the stoichiometric formula to figure out how much fuel you're drinking.