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Old 07-05-2012, 10:55 PM   #1
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Ultra gauge way off

Hoping someone can help. I've calibrated my ug, but my avg mpg and distance tol empty are super far off, like 750 miles and 16000 respectively. Any thoughts?
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Old 07-06-2012, 12:08 AM   #3
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How did you calibrate?
The unit will self-calibrate fuel correction factor as you progress.
Don't reset the calibration or zero the total MPG... Let it go for 5 or 6 tanks, add the TOTAL fuel for all tanks, then plug that number in. It'll give you a more accurate correction factor. My '08 is at 1.093 after calibrating on 57.4 gallons today.
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Old 07-06-2012, 07:59 AM   #4
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2011. Been doing the full tank instructions. Currently at 1.035. Don't think dte should be 15000 miles.
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Old 07-06-2012, 08:01 AM   #5
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You only set the fuel usage counter once. After that you push and hold up when you refuel.
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Old 07-06-2012, 11:44 AM   #6
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I do full fill up, but also enter in the exact amount of gas it took to fill up. This is what calculates the 1.035 I currently have. My instant mpg is off also. Reading 26 mpg at 65 mph.
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Old 07-06-2012, 11:49 AM   #7
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Quote:
Originally Posted by shoebag22 View Post
Not true. You do full fill up, but also enter in the exact amount of gas it took to fill up. This is what calculates the 1.035 I currently have. My instant mpg is off also. Reading 26 mpg at 65 mph.
That's why I said you enter the used gallons once. You do this when you start from a new tank and after you reset that parameter with the new tank.

Trust me. I had a UG and it worked fine because I read the directions.
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Old 07-06-2012, 02:56 PM   #8
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From the instructions.

  • Multi-fill-up Calibration:
    1. 2. 3. 4. 5. 6.


Fill up the fuel tank.


[IMG]file:///page36image17276[/IMG] Set the ignition to the RUN position (Engine Off)


[IMG]file:///page36image17744[/IMG] Press and hold the UP key to cause UltraGauge to recognize the fill-up


[IMG]file:///page36image18292[/IMG] Zero the Average MPG. MENU --> Gauge/Page Menu .. --> Zero Ave MPG, G/H.


[IMG]file:///page36image18860[/IMG] Exit the Menu system


[IMG]file:///page36image19228[/IMG] Drive until its time for the next fuel fill-up.


[IMG]file:///page36image19696[/IMG]
At the next fuel fill-up, fill the fuel tank and note the number of gallons/liters used (pumped). (Always use


[IMG]file:///page37image1076[/IMG] the same fuel station and the same fuel pump)


[IMG]file:///page37image1544[/IMG] a. Repeat step 6. Proceed to Step 8 after 2-4 fill ups. 8.


Set the ignition to the RUN position (engine off)


[IMG]file:///page37image6160[/IMG] Press and hold the UP key to cause UltraGauge to recognize the fill-up


[IMG]file:///page37image6708[/IMG] Select MENU --> Vehicle Setup.. --> Calibration.. --> Calibrate MPG/Fuel, and change the value displayed


[IMG]file:///page37image7296[/IMG] to the amount of total sum of fuel recorded in step #7. Press MENU when complete to set and save the


[IMG]file:///page37image8004[/IMG] calibration.


[IMG]file:///page37image8312[/IMG] Exit the Menu system the cal is complete


[IMG]file:///page37image8760[/IMG]

I am asking for help and don appreciate being talked to like a child. I read and follow these instructions. Why is my instant mpg way off as well?
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Old 07-06-2012, 03:03 PM   #9
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I think you're recalculating it every time. I made that mistake too. Either that or you didn't go to the exact same fuel pump to calibrate.
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Old 07-06-2012, 03:10 PM   #10
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Quote:
Originally Posted by shoebag22 View Post
Why is my instant mpg way off as well?
do you have a 4 or 6 cyl? that could actually be your instant, it changes a bunch with a tiny change in elevation?
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Old 07-06-2012, 03:15 PM   #11
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Quote:
Originally Posted by shoebag22 View Post
From the instructions.

  • Multi-fill-up Calibration:
    1. 2. 3. 4. 5. 6.


Fill up the fuel tank.


[IMG]file:///page36image17276[/IMG] Set the ignition to the RUN position (Engine Off)


[IMG]file:///page36image17744[/IMG] Press and hold the UP key to cause UltraGauge to recognize the fill-up


[IMG]file:///page36image18292[/IMG] Zero the Average MPG. MENU --> Gauge/Page Menu .. --> Zero Ave MPG, G/H.


[IMG]file:///page36image18860[/IMG] Exit the Menu system


[IMG]file:///page36image19228[/IMG] Drive until its time for the next fuel fill-up.


[IMG]file:///page36image19696[/IMG]
At the next fuel fill-up, fill the fuel tank and note the number of gallons/liters used (pumped). (Always use


[IMG]file:///page37image1076[/IMG] the same fuel station and the same fuel pump)


[IMG]file:///page37image1544[/IMG] a. Repeat step 6. Proceed to Step 8 after 2-4 fill ups. 8.


Set the ignition to the RUN position (engine off)


[IMG]file:///page37image6160[/IMG] Press and hold the UP key to cause UltraGauge to recognize the fill-up


[IMG]file:///page37image6708[/IMG] Select MENU --> Vehicle Setup.. --> Calibration.. --> Calibrate MPG/Fuel, and change the value displayed


[IMG]file:///page37image7296[/IMG] to the amount of total sum of fuel recorded in step #7. Press MENU when complete to set and save the


[IMG]file:///page37image8004[/IMG] calibration.


[IMG]file:///page37image8312[/IMG] Exit the Menu system the cal is complete


[IMG]file:///page37image8760[/IMG]

I am asking for help and don appreciate being talked to like a child. I read and follow these instructions. Why is my instant mpg way off as well?
You only calibrate once after you burn through a full tank. Are you calibrating more than once?
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Old 07-06-2012, 03:23 PM   #12
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Whippersnapper is somewhat incorrect on the fuel calibration.

No, it does not need to be done every time, but it MAY need to be done occasionally as fuel blends change. Mine was running dead-on with manual calculations at 1.082, but about a month ago it became optimistic.
Changes in octane and ethanol content will impact the calibration, which is one reason UG says to use the same station and same pump. My change in accuracy coincided with my switching to premium for the hotter months to help keep the knock sensor happy.
I re-ran the calibration through 4 tanks and am now at around 1.093. I'll know how correct it is on the next fuel up.

BTW: Running premium on my 2.7 I'm not seeing any difference in actual MPG or power

I'm surprised you're getting 1.03. My UG was about 4mpg optimistic at 1.00 from the factory.
Like I said... leave it alone, and after 4 or 5 tanks, set the calibration with the TOTAL amount. Like I said, I used a total of 57.4 gallons to calibrate.

One tank of 14 gallons is not enough to get very close, which is why the instructions recommend 4 tanks, but the more the better.
You can run 10 tanks if you'd like, but when I got mine, I'd calibrate on every tank (I did not reset totals) and after 4 or 5 tanks I was finding the pre-input gallons within a hundredth or three and I wasn't seeing any change in the calibration factor.

Quote:
Why is my instant mpg way off as well?
Your instant MPG is off because it is not properly calculating your fuel usage, and possibly not properly calculating your distance.
That said... 65mph, depending on whether it's uphill or downhill, my instant MPG could be anywhere between 8 and 200... flat and level roadway at 65, I would not be at all surprised to see 26.


On your DTE, that's a function of current MPG (not instant, most likely "SRT" which is average since last reboot) and tank size.
When you tell it that you filled the tank, does it confirm 21 (or actually, 21.1) gallons, or is it higher?
I don't recall what the factory default was for the tank size, but I had to adjust it.

You may have to calibrate distance as well. Mine was off slightly. UG uses the same data source as the speedometer/odometer, so there may be some variation against reality. Personally, since I drive by the odometer, I don't mind if the UG is a little off from the GPS as long as it matches the odometer... but even at that, I think I have a small correction factor of a fraction of a %.
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Old 07-06-2012, 03:25 PM   #13
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I never calibrated more than once and my gauge was fairly close to what I was getting. I do my own math for average MPG.

This is one of the reasons I like my SG better. You tell it how much you burned at each fillup.
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Old 07-06-2012, 03:29 PM   #14
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Quote:
Originally Posted by whippersnapper02 View Post
You only calibrate once after you burn through a full tank. Are you calibrating more than once?
I know it's a difficult quote to read because of the dead images....
Quote:
1 - Fill up the fuel tank.

2 - Set the ignition to the RUN position (Engine Off)

3 - Press and hold the UP key to cause UltraGauge to recognize the fill-up
Zero the Average MPG. MENU --> Gauge/Page Menu .. --> Zero Ave MPG, G/H.

4 - Exit the Menu system

5 - Drive until its time for the next fuel fill-up.

6 - At the next fuel fill-up, fill the fuel tank and note the number of gallons/liters used (pumped). (Always use the same fuel station and the same fuel pump)

7 - Repeat step 6. Proceed to Step 8 after 2-4 fill ups. 8.

8 - Set the ignition to the RUN position (engine off)

9 - Press and hold the UP key to cause UltraGauge to recognize the fill-up
Select MENU --> Vehicle Setup.. --> Calibration.. --> Calibrate MPG/Fuel, and change the value displayed to the amount of total sum of fuel recorded in step #7. Press MENU when complete to set and save the calibration.

Says right there to repeat the fill/drive cycle 2-4 times before proceeding to calibration.
They expect a 25-50 gallon calibration number, not a single 10 gallon fill.


You mentioned that your UG was not that accurate on fuel used, and we speculated that part of this may be due to the injector shutoff on high speed decel at 0% throttle, but another part of it may be your calibration being off.

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Old 07-06-2012, 03:31 PM   #15
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Quote:
Originally Posted by whippersnapper02 View Post
I never calibrated more than once and my gauge was fairly close to what I was getting. I do my own math for average MPG.

This is one of the reasons I like my SG better. You tell it how much you burned at each fillup.
Right... you only need to calibrate once (unless you change octane or ethanol content), but you need to give it enough data to work with for an accurate calibration.
A single fill up is not enough.


And ya... in retrospect, there's a lot of reasons that I'm kicking myself for not getting the SG. I like the UG, but I think I'd like the SG a lot more.
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Old 07-06-2012, 03:57 PM   #16
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But you do tell the UG how much you burn each time. That is the gallons used, which in turn affects your calibration factor.

I did it for 5+ fillups, each time. The UG got more and more accurate, until it's gallons used was only off by a few tenths of a gallon. When I quit calibrating, it was nearly dead on.

Now I just use it to get a relative reading of how I'm doing.
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Old 07-06-2012, 04:05 PM   #17
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Quote:
Originally Posted by pdrunk View Post
But you do tell the UG how much you burn each time. That is the gallons used, which in turn affects your calibration factor.

I did it for 5+ fillups, each time. The UG got more and more accurate, until it's gallons used was only off by a few tenths of a gallon. When I quit calibrating, it was nearly dead on.
Correct.

You CAN keep a running total and update the calibration as long as you want and it will constantly "fine tune" (unless you change octane or ethanol), but as you and I have found, after 4 or 5 fill ups, it is so close that it's not work messing with unless something seems wrong, which is what happened to me when I switched to premium last month.
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Old 07-06-2012, 04:10 PM   #18
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I did it once and it was close enough until I broke it. In the end I use it as a driving tool and not for actual MPG calculations. For that I resort to the old math method.
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Old 07-06-2012, 04:17 PM   #19
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This is my fifth fill up. At each I hold down the up key until full tank is reported, then go in and manually enter the amount of gas I just put in the tank. The ug has been off by no more than a gallon, which tells me that it is fairly accurate on my fuel consumption. How can it be accurate on my consumption but tell me that I have 15678 miles until empty?
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Old 07-06-2012, 04:23 PM   #20
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Quote:
Originally Posted by shoebag22 View Post
This is my fifth fill up. At each I hold down the up key until full tank is reported, then go in and manually enter the amount of gas I just put in the tank. The ug has been off by no more than a gallon, which tells me that it is fairly accurate on my fuel consumption. How can it be accurate on my consumption but tell me that I have 15678 miles until empty?
Did you remember to zero avgMPG and everything else the manual said to? First time I held up for a refill, inputted gallons used, but did t zero anything and I think I saw the same crazy numbers as you.

DTE is based on avgMPG, which jumps dramatically until you get close to empty. On this tank my avg was up to 27, down to 22, now at 23.5 with only 2-3 gallons used.
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