Calibrating the fuel economy gauge - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 12-30-2007, 05:39 PM Thread Starter
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Calibrating the fuel economy gauge

Is there any sort of correction factor that can be applied to the fuel economy gauge on the newer Mercedes, at the dealer?

My B 200's on board computer is about 5-7% optimistic and I'd like to have it corrected, if possible.

2008 Mercedes-Benz B 200 5 speed
2006 smart BRABUS Tailor Made Canada 1 cdi cabriolet
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post #2 of 8 (permalink) Old 12-31-2007, 01:18 AM
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I have not checked for a B-class but usually there is an option to adjust the fuel consumption reading by SDS.

Perhaps the gasser injectors are not equally accurately known for the computer/ECU to allow a more accurate reading. 5-7% means already pretty good accuracy but the average error on my CDI has been less than 2%.
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post #3 of 8 (permalink) Old 01-02-2008, 12:09 AM Thread Starter
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Thanks for the information!

What is SDS? Something the dealer has access to through Star Diagnostic?

2008 Mercedes-Benz B 200 5 speed
2006 smart BRABUS Tailor Made Canada 1 cdi cabriolet
2013 Ford Fiesta SE 5 speed, for the kids
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post #4 of 8 (permalink) Old 01-02-2008, 10:32 AM
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What is SDS? Something the dealer has access to through Star Diagnostic?
I was referring to Star Diagnosis System by "SDS".
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post #5 of 8 (permalink) Old 01-02-2008, 10:54 AM
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I haven't had a look at DAS for a B-class at this detail, now that I did, I was not able to find the same setting on the cluster for the fuel consumption as other models have (like W211). Does the B-class have a "normal" computer for average mileage etc. or is it just showing the instantaneous consumption?
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post #6 of 8 (permalink) Old 01-02-2008, 03:39 PM
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Hi Mike,
My C350 trip computer shows about 5% error, optimistic, averaged over tens of thousands of kilometres. (I wish to deny I am a hopeless nerd! (joke!))
To put it in proportion, that amount of error is about the change in rolling radius of tyres from new to worn. My car has the MB optional 17" rims with appropriate rubber, not the historically fitted 16" rims and rubber from the start of production.
So it is quite likely that the trip computer will not be spot on for accuracy.....
I have visited YVR twice and enjoyed your lovely city.
Regards from hot and dry Australia.
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post #7 of 8 (permalink) Old 01-04-2008, 10:38 PM Thread Starter
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Thanks for the further information!

The B Class displays the same data as the C Class, After Start and After Reset.....

I calculate the difference in circumference between new and 2 mm of tread (assuming 9 to start) at 2.5% for the B Class, so yeah it'll "only" be 2.5% optimistic when the car has bald tires!

I still would prefer to have it less optimistically set, if SDS allows for that. I'll take it up with my dealer when they tidy up the interior after the sunroof leak was recently fixed (2 month old car!).

Audiophile_AU, I live on Vancovuer Island, which is off the west coast a tad, though we are only 40 km W of Vancouver. I have full fuel economy data for all of my cars at Spritverbrauch berechnen und Autokosten verwalten, including well over 330,000 km of data on my Peugeot 405.

2008 Mercedes-Benz B 200 5 speed
2006 smart BRABUS Tailor Made Canada 1 cdi cabriolet
2013 Ford Fiesta SE 5 speed, for the kids
1966 Peugeot 404 Coupé Injection, restoration underway
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post #8 of 8 (permalink) Old 01-05-2008, 02:14 AM
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Considering the trip meter miles, a car magazine measured my car model having 1.5% pessimistic miles reading to start with (assume they had new tyres). Pessimistic here from the MPG figure point of view, trip reporting less miles than actually driven. The trip computer miles would in this case be marginally optimistic with worn tyres (assume starting from 9mm and go down to 2mm, that would be 2.03% reduction on the W221 tyre from new to worn out).

Some car models/brands are reported having of the order of 4.5% optimistic trip computer readings already for miles, not to mention the fuel consumption.
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