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Old 05-18-2023, 08:47 PM #1
skag1T skag1T is offline
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Can i Calibrate the computer average mpg>
Computer "Average mpg" if off by 1mpg compared to the mpg calculated the old fashioned way (divide miles travelled by the amount of gasoline needed to full). Car mpg = 17.4, calculated mpg = 18.5.

I trust the calculated method, so is there a way to calibrate the mpg displayed by the car ?
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Old 05-18-2023, 09:00 PM #2
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I am not sure, but for my 4runner, the variation between manually calculated and computer average has varied based on use. When I have a heavy load or I am towing, calculated tends to be better than computer. With light loads and highway it is usually worse. Variance is never more than +/- 1 mpg. I have not tested for temperature impact. I have no clue why this would be. I am running slightly larger tires than stock.
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Old 05-19-2023, 09:18 PM #3
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mine is completely stock and this is daily driving about 30% highway and 70% city.
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Old 05-20-2023, 12:35 PM #4
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Quote:
Originally Posted by skag1T View Post
Computer "Average mpg" if off by 1mpg compared to the mpg calculated the old fashioned way (divide miles travelled by the amount of gasoline needed to full). Car mpg = 17.4, calculated mpg = 18.5.

I trust the calculated method, so is there a way to calibrate the mpg displayed by the car ?
No. It is only a guess anyways, and sometimes a very poor guess.
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Old 05-20-2023, 01:09 PM #5
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Whelp, mine is extremely accurate.
From and old post…
Quote:
My on-board computer is very accurate.
Wanna know how accurate?
This is for 115k miles of mileage tracking. 395 fill-ups.
Average of computer readings (computer reset at every fill-up): 20.91mpg
Average of manually calculated readings: 20.98mpg
Total mileage/total gas: 20.97mpg

The worst differences between manually calculated and the on-board computer has been +1.57mpg and -1.46mpg

Out of 395 fill-ups, only 15 times has the difference between hand calculated and on-board computer has exceeded 1mpg.
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Old 05-23-2023, 02:44 AM #6
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Quote:
Originally Posted by Chumly View Post
I am not sure, but for my 4runner, the variation between manually calculated and computer average has varied based on use. When I have a heavy load or I am towing, calculated tends to be better than computer. With light loads and highway badland it is usually worse. Variance is never more than +/- 1 mpg. I have not tested for temperature impact. I have no clue why this would be. I am running slightly larger tires than stock.
Maybe it's something else than Variance, since Variance in this case doesn't matter.
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