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?
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--------------------------------------------------
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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