Date: Tue, 15 Jul 2003 08:24:41 +1000
From: Peter Wilkins <>
Subject: Re: 9-5 Gas Mileage?  Urgent

On 14 Jul 2003 08:16:19 -0600, andrewunix <agreenbunopsamnet> wrote : >Mon, 14 Jul 2003 02:31:46 GMT, = suggested: >: It's got 40,000 miles, so yes, it is broken in. ;-) > >Are you calculating the mileage yourself or are you just going by the = SID?=20 >The SID calculation of MPG on my car is always 25% or so below reality. Apparently the SID accuracy does vary quite a bit from car to car. I'm lucky: I've found mine very accurate, under the correct test conditions. If I fill the tank, zero the SID and trip meter, do a long trip (around 500km or until the tank is nearly empty), then fill the tank again, read the trip meter, and check the calculated consumption against the SID, it's always very close. The biggest source of error in the manual calculation is in filling the tank to the same level each time, so I usually do cumulative calculations over a series of successive fills - fairly easy here in Oz where my average holiday trip runs around 2000 to 4000 km. However, the SID reading can fluctuate wildly shortly after zeroing, as the averaging base is low, so if you zero it then take a reading just after going flat out up a steep hill, you may see 20 or even up to 50 l/100km, or in your terms, 14 down to 6 mpg! After you have a good few miles up, the fluctuations are much less. --=20 Regards, Peter Wilkins

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