I also think that your tank fill procedures contribute to the variation.
I always spend the extra few minutes to top my tank all the way up,
rocking and bouncing the car until no more air comes out and fuel is
most of the way up the neck. I also gauge the slope and try to park
pointing down hill when refilling. My calculated fuel consumption is a
very consistently between 25.0 and 26.5 mpg ('87 300TD).
Max
-----Original Message-----
From: mercedes-boun...@okiebenz.com
[mailto:mercedes-boun...@okiebenz.com] On Behalf Of LarryT
Sent: Monday, November 23, 2009 9:11 PM
To: Mercedes Discussion List
Subject: Re: [MBZ] WOW! 45 mpg 1984 Mer Benz Diesel - $800
Hi Tyler,
You wrote: (Odometers are generally not very accurate)
Maybe I've been lucky. The odo on my '91 300D seems to be very
consistent.
SO I guess it could b consistently wrong but my mileage is always
between 29
and 31 mpg. I think the delta is from additives in the fuel provided
by
the fuel co. and perhaps some minor difference in the "Off" moment (when
the nozzle shuts the flow off).
LarryT
91 300D
OilAnalysis Time?
Looking for Weber Parts or Porsche Posters?
www.youroil.net
--------------------------------------------------
From: "Tyler" <casi...@usermail.com>
Sent: Monday, November 23, 2009 4:25 PM
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Subject: Re: [MBZ] WOW! 45 mpg 1984 Mer Benz Diesel - $800
> In my experience, even people whom know how to divide correctly and
> keep track of distance and volume generally get the economy wrong by
> 20% or more. Odometers are generally not very accurate, and there
> isn't much consistency between the full tank shutoff at gas stations.
>
> Both of my cars will often have a huge discrepancy between the
> odometer miles/gallons from a particular fill and the more accurate
> calculation from a long term average across multiple tanks of fuel,
> and using a correction factor for the odometer.
>
> A good illustration of this is on fuelly.com. Here is the page for the
> 190D (the '87 is mine):
>
> http://www.fuelly.com/car/mercedes-benz/190d
>
> There are 4 190Ds, and you will see that they all seem to vary by
> about 5mpg between tanks. With my own car, I've tried adjusting this
> for fuel quality and the type of driving, and found that it doesn't
> change the variation much- it seems like mostly "random error,"
> probably from the pump shutting off at different levels.
>
> Tyler
>
>> You're giving him a lot of credit. Its usually "I drove about 100
>> miles (meaning 80) and put in about 5 gallons of fuel (meaning 5.8)
>> so thats about 45mpg"
>>
>> Very few people even really know how to calculate mpg, never mind
>> bothering to use real numbers.
>>
>> -Curt
>
>
>
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