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Re: [T3] Gas mileage experiments


On 28 Aug 2005 at 15:47, Russ Wolfe wrote:

> A true way to check over all gas milage, is to record the consumption
> over several tanks of gas, and then calculate it. I notice that some of
> you figures were on less that 5 gal. fillups. This could be effected by
> the way the car was sitting when you filled it, the senstivity of nozzle
> on the pump, etc.

Every tank of gas that goes in each of our cars gets recorded. On this car, I'm 
the one who filled it, so each fillup was done to the same level.

> I have always done the 5 tanks fulls and then figure it.

That certainly helps average out random variations, but I wanted to do these 
test runs over single medium length trips. I thought the results were pretty 
much in line with each other, even though they were more extreme than I 
expected.

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.

It would certainly be interesting to do this on the next caravan to Invasion 
'06, but I doubt if any of us will have the stomach for it. OTOH, with gas 
prices going the way they are, we may not have much choice.

It would probably take us an extra day to get there.

-- 
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

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