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Re: Onboard MPG Calculators--Where Do They Get The Gallons #s ?
Posted to Technical Theory Forum on 5/29/2011

There are a number of ways FE estimates can be done. MAF g/s and assumed fuel usage to go with it, injector pulse width and assumed fuel pressure, fuel level over time and assumed gauge accuracy, etc.

Each manufacturer chooses their own methods to calculate ... Login to read more.