dash mpg verus actual
#1
dash mpg verus actual
My current truck gets about 10% more mpg than the instrument gauges report. Are the later year f150s actual and gauge reported figures the same? thanks
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flyflotr (06-18-2019)
#5
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There are ways to calibrate the onboard computer to match your driving style, at least with some trucks. And that is the key. Everybody drives different. If your truck is showing significantly different from what you get when you hand calculate it then your driving style is much different than expected. I've never had the onboard calculation be more than 1/2 mpg different than what I get by doing hand calculations. It is usually closer to .2 or .3 mpg different and at times my hand calculations are better than what the trucks computer says.
#7
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MPG with a Suburban I had from day 1 never wavered.
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There is nothing on the truck that directly measures fuel flow. The most-precise way would be to keep a running total of injector on-time, but that's probably too complex for such a simple PCM to keep track of. I don't have the latest service manuals, and I don't know when that function appeared (my manuals stop around 2007), but I assume it simply guesses based on the fuel level sender (the same one that feeds the gauge).
Last edited by Steve83; 05-30-2019 at 09:53 AM.