overhead computer
05-10-2011, 03:10 PM
#1
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overhead computer
I just confused the service manager at my dealership with my question, so I decided to ask it here, knowing there is a lot of wisdom and experience in this forum.
It is such a minor thing, but I am a few days from being out of my extended warranty, and my overhead computer seems increasingly inaccurate when measuring my fuel economy. When new and for the first couple years it was pretty accurate compared to had calculation.
Beginning about two years ago, it started consistently overestimating my actual mileage and becoming worse with time.
Now I am consistently 20% off or about 3.5-4.0 mpg off when compared to hand calculating.
Has this been an issue for others? Can it be recalibrated? If it is broke, I would like to use my warranty to fix it.
Any help, as always is very much appreciated.
It is such a minor thing, but I am a few days from being out of my extended warranty, and my overhead computer seems increasingly inaccurate when measuring my fuel economy. When new and for the first couple years it was pretty accurate compared to had calculation.
Beginning about two years ago, it started consistently overestimating my actual mileage and becoming worse with time.
Now I am consistently 20% off or about 3.5-4.0 mpg off when compared to hand calculating.
Has this been an issue for others? Can it be recalibrated? If it is broke, I would like to use my warranty to fix it.
Any help, as always is very much appreciated.
05-10-2011, 04:15 PM
#3
DTR Detective
Have you had any flashes performed when in for service? Mine started out about 1-1.5mpg high, since the last flash it reads 20-22mpg when I'm getting 16-17mpg hand-calc. I've seen as high as 24mpg on the O/H during long trips.
P.S. I find the DTE to be much more of an accurate reading.
P.S. I find the DTE to be much more of an accurate reading.
05-11-2011, 05:26 AM
#6
Advocate of getting the ban button used on him...
The only real thing they are good for is bragging rights to people that don't know any better!
From the factory mine was off by about 3-4mpg but after getting the Smarty Jr. it is actually much closer now. Only off by about 1-2mpg.
From the factory mine was off by about 3-4mpg but after getting the Smarty Jr. it is actually much closer now. Only off by about 1-2mpg.
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05-11-2011, 08:21 AM
#9
Advocate of getting the ban button used on him...
05-11-2011, 12:41 PM
#10
Registered User
Mine is also consistently 4 to 5 mpg high, based on my normal daily driving routine. Knowing that, if it should suddenly take a significant drop this could be an indication of a problem elsewhere. But of course, a quick hand calculation to verify would be in order as well.
At least, thats my logic, is it flawed?
At least, thats my logic, is it flawed?
05-12-2011, 02:08 AM
#11
The lie-o-meter in both my trucks is the same way. Sometimes it will read as high as 27 MPG, which I know is a pipe dream, and other times its as low as 7 MPG.
Stick with hand calculations, and switch the gauge over to something more useful, like the direction and tempurature.
-Kris
Stick with hand calculations, and switch the gauge over to something more useful, like the direction and tempurature.
-Kris
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