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dash mpg verus actual

 
Old 05-22-2019, 11:19 PM
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Default 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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Old 05-22-2019, 11:30 PM
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Well whats your current truck? (ie year, trim level, engine, etc.) We aren't mind readers.
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Old 05-23-2019, 12:55 AM
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This thread might be useful if your truck is capable of being calibrated https://www.f150forum.com/f2/epa-mpg...rified-205221/
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Old 05-23-2019, 10:23 AM
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Click these & read the captions:


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Old 05-23-2019, 05:20 PM
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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.
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Old 05-29-2019, 03:48 PM
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How does the pickup calculate the fuel used? I always assumed it actually measured it. But if it is not always exactly accurate that can't be correct.
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Old 05-29-2019, 05:16 PM
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Originally Posted by Larry Guthrie View Post
How does the pickup calculate the fuel used? I always assumed it actually measured it. But if it is not always exactly accurate that can't be correct.
For some, the calculation includes miles to next fill. Being that this number can vary from tank to tank based on factors like speed, load and type of fuel, I've always considered the number to be ballpark at best on an F150.

MPG with a Suburban I had from day 1 never wavered.
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Old 05-29-2019, 05:44 PM
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Originally Posted by Larry Guthrie View Post
...the fuel used? I always assumed it actually measured it.
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.
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Old 05-30-2019, 01:39 AM
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Whats the highway range of a max trailer tow package 36gallon fuel tank ?
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Old 05-30-2019, 04:07 AM
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Follow the link fix your mpg display.

https://www.f150forum.com/f118/fix-i...inutes-421912/
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