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#1
09-13-2018, 04:41 PM
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Adjusting the MPG Gauge
Awhile ago I thought I read a posting about adjusting the MPG Gauge readout on a W211 using Xentry. I cannot find that post. I have a W221 that displays 3mpg more that what the car is getting and thought that maybe the "'how to" for the w211 might be relevant.
Thanks, Greg
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Greg 2012 S350 BlueTEC 4Matic 2007 ML 320 CDI 2007 Leisure Travel Serenity 2006 Sprinter 432k 2005 E320 CDI 1998 SLK230 (teal) 1998 SLK230 (silver) 1996 E300D 99k, 30k on WVO Previous: 1983 240D, on WVO 1982 300D, on WVO 1983 300CD, on WVO 1986 300SDL 237k, 25k on WVO (Deerslayer) 1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix 1983 380 SEC w/603 diesel, 8k on WVO 1996 E300D 351k, 177k on WVO 
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#2
09-13-2018, 05:00 PM
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Here's how I do it on mine.
Control Units Information and Communication Instrument Cluster Control Unit Adaptations Settings Trip Computer Settings Correction Factor of Fuel Consumption Remember, since your MPG is HIGH, you will use a positive correction factor since it is reading fuel consumption as being lower than it actually is.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#3
09-15-2018, 01:20 PM
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Quote:
If I want an 8% increase in fuel consumption, to lower the displayed MPG by 8%, what number is used for the correction factor ? +8, +.08, ?? Thanks Greg
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Greg 2012 S350 BlueTEC 4Matic 2007 ML 320 CDI 2007 Leisure Travel Serenity 2006 Sprinter 432k 2005 E320 CDI 1998 SLK230 (teal) 1998 SLK230 (silver) 1996 E300D 99k, 30k on WVO Previous: 1983 240D, on WVO 1982 300D, on WVO 1983 300CD, on WVO 1986 300SDL 237k, 25k on WVO (Deerslayer) 1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix 1983 380 SEC w/603 diesel, 8k on WVO 1996 E300D 351k, 177k on WVO
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#4
09-16-2018, 04:28 AM
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Quote:
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#5
09-13-2018, 05:18 PM
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Thanks. My MB shop foreman said that it was not possible to adjust. Maybe a W221 is different? but I am finding that hard to believe.
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Greg 2012 S350 BlueTEC 4Matic 2007 ML 320 CDI 2007 Leisure Travel Serenity 2006 Sprinter 432k 2005 E320 CDI 1998 SLK230 (teal) 1998 SLK230 (silver) 1996 E300D 99k, 30k on WVO Previous: 1983 240D, on WVO 1982 300D, on WVO 1983 300CD, on WVO 1986 300SDL 237k, 25k on WVO (Deerslayer) 1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix 1983 380 SEC w/603 diesel, 8k on WVO 1996 E300D 351k, 177k on WVO
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#6
09-13-2018, 05:57 PM
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I've had difficulty getting mine exactly right....keep overshooting it one way or the other.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife Last edited by shertex; 09-16-2018 at 05:23 AM.
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#7
09-13-2018, 07:34 PM
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Quote:
Before adjusting, I'd be looking for a reason why it isn't accurate especially if you have had the car a while and this is a new development. In general, a MPG system calculates fuel usage based on distance traveled and injector pulse width. If this car does not have electronic injectors, it would be recording injection pump rack position then calculating from there. The system would be looking at fuel tank level to calculate miles to empty and might be looking at how fast the fuel gauge drops to trim MPG reading. If the system only looks at injector pulse width or rack position, a leaky injector / poor spray can affect actual MPG but the calculated MPG will be incorrect as it is based on a properly operating system.
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#8
09-16-2018, 09:52 PM
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Thanks. I will let you know how it goes. Wed. I am going to the dealer to have the SplitView option activated. It was not legal in the state the car was sold in at the time the car was delivered. It is now. While they are in there, I will see if they can change the consumption factor. They say that it cannot be done. A week ago they said they could not activate the SplitView, but now they can...
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Greg 2012 S350 BlueTEC 4Matic 2007 ML 320 CDI 2007 Leisure Travel Serenity 2006 Sprinter 432k 2005 E320 CDI 1998 SLK230 (teal) 1998 SLK230 (silver) 1996 E300D 99k, 30k on WVO Previous: 1983 240D, on WVO 1982 300D, on WVO 1983 300CD, on WVO 1986 300SDL 237k, 25k on WVO (Deerslayer) 1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix 1983 380 SEC w/603 diesel, 8k on WVO 1996 E300D 351k, 177k on WVO
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#9
09-20-2018, 04:34 PM
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They could not do it on a W221.
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Greg 2012 S350 BlueTEC 4Matic 2007 ML 320 CDI 2007 Leisure Travel Serenity 2006 Sprinter 432k 2005 E320 CDI 1998 SLK230 (teal) 1998 SLK230 (silver) 1996 E300D 99k, 30k on WVO Previous: 1983 240D, on WVO 1982 300D, on WVO 1983 300CD, on WVO 1986 300SDL 237k, 25k on WVO (Deerslayer) 1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix 1983 380 SEC w/603 diesel, 8k on WVO 1996 E300D 351k, 177k on WVO
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