Re: [T3] Gas mileage experiments

[John Jaranson <jaransonT3@comcast.net>]

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On Aug 28, 2005, at 10:33 PM, Jim Adney wrote:

> Note that these 3 fillups were back-to-back so if I take all three 
> together I
> get:
>
> 		407  miles		14.33 gallons		28.4 mi/gal
>
> Which is still surprisingly high, at least to me, and with a little 
> less
> uncertainty, since errors in measurement are reduced by eliminating 2 
> of the
> intermediate error sources.

 Here is a chart I did of the mileage for my dual carbed 66 Squareback. 
I track it every tankfull.

http://mywebpages.comcast.net/jaransonT3/SophyMPG.jpg

 Two things that really stick out. Temperature has a significant role 
in the mileage (at least with carbs...the FI might be better) as can be 
seen by the difference between the summer and winter months mileage.   
I get an average in the summer of 24.3 mpg and a winter average of 18.8 
mpg.

 The other thing is that there is a bunch of variation from tank to 
tank depending on where and how you drive, long trips vs. short, 
highway vs city, etc, etc. It is not uncommon to see 4-6 mpg difference 
from one tank to the next.   The best tank full is right around 29mpg.  
The worst is a tick over 14 mpg.

Later,
John Jaranson
'66 Square (Sophy)
'70 Fasty (Jane 2 - Type 3 Lead Sled wannabe)
'71 Fasty (Jane -parts car due to rust)
various parts.....don't we all.
http://mywebpages.comcast.net/jaransonT3/jaransonT3/
http://mywebpages.comcast.net/jaransonT3/2006Invasion/
http://mywebpages.comcast.net/jaransonT3/notavwclub/

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