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Old 10-23-2011, 05:06 PM   #1
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Is the MPG LCD Read Out accurate?

Do you guys think the MPG gauge is accurate? I took a 350 mile trip in my newish 09 Foci SE 4dr. The gauge read 37.7 MPG (85% HWY) on the way there and 39.7 (99.9% HWY) on the way back.

I did the math at the pump (Miles / Gallons used) and I only came up with 35.2 there and 37.2 on the way back.

(I am not necessarily complaining about the MPG... considering my 07 MTX only got a best ever of 31mpg on the hwy.)

So still really happy with the MPG's but disappointed in the LCD MPG read out... hoping it was going to be more accurate. I suppose its still valuable to follow but I can't believe what I read 100% I guess.

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Old 10-23-2011, 05:13 PM   #2
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Its close enough for me, and better then not having one. After 50,000 miles mine seems to be pretty close (+/-1mpg)
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Old 10-23-2011, 05:40 PM   #3
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I would think it is a little car dependent. so it is around right, but only average..
Thus maybe a few have a really good correlation, and others not so good.
The op system seems to be 2.5 mpgs optimistic.
I have not had long trips to do stuff with. Although i do have a recorded total at 2,140 miles with 61 gallons gas used so it is 35.1 mpg total avverage.
I have been getting better mpgs as time goes on.. so I would say it correlate well wit the mpg meter. if the meter is off, it is off the same all the time.. so it does offer a good insight into what actions produce the best fuel economy. And taht is it's most useful feature. Promoting good habits to conserve gas.
I love mine, and have to say I am a little too 'into' the mpg meter.. But after awhile I am sure my fascination will pass.

I wanted to buy an "Ultrameter" to do even more mpg stuff, but the flaw with it wearing out the battery, for me, is a killer, as I always go days between car use. (retired and all)

So I do not see the meter being a few mpg off as an issue.
As long as it is reasonably consistent, it is worth using. (the Ultrameter ,and Scan meter have adjustments, i would guess the Focus should have some, but then it would become complicated... and that is a problem in itself.)

Last edited by Elizabeth; 10-23-2011 at 09:25 PM.
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Old 11-16-2011, 08:00 AM   #4
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YEah so far after almost a month of driving... the MPG gauge is about 2MPG off consistently because the "at the pump" numbers are not the same...
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Old 11-16-2011, 08:28 AM   #5
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Mine is pretty accurate.

The avg MPG is pretty close and the "Miles to go" usually goes hand in hand with the reported average mpg.

I have a heavy foot most days though so mine changes pretty frequently.
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Old 11-16-2011, 01:21 PM   #6
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Mine usually reads a bit high in city driving and a bit low in highway driving.
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Old 11-17-2011, 10:50 PM   #7
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It's usually 1-2 mpg too high for me, after doing the actual math. But it's good for seeing how many miles per tankfull.
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Old 11-18-2011, 08:49 PM   #8
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I'm usually 1 mpg high on the readout compared to the math at the pump.
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Old 11-18-2011, 09:31 PM   #9
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Mine was usually only 1-2 high. But recently after having my crummy mileage, turns out I'm reading low. My 215/45/17 makes the car read a tad slower thus destroying my mileage lol
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Old 01-11-2012, 09:49 AM   #10
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Mmm... pretty interesting... the responses to my thread seem to indicate that the digital gauge's MPG results are all over the place!
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