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

I believe the on-board MPG calculators use a fuel rate inferred from injector on-time and the vehicle-speed signal in their MPG calculations.

For the "miles-to-empty" calculation, I believe they use the current MPG [or current avg MPG]and how much fuel is re... Login to read more.