Date: 3 Dec 1998 05:31:59 GMT
From: baur323nopsamcomNOSPAM (Baur323)
Subject: Re: Average speed

>Hello, > >I just bought a new 93. Recently, I was driving about 110 km/h on a >freeway with the cruise control enabled. I then reset the average speed >on the computer. After a minute or two, I was puzzled to see the >computer indicate a speed about 6km/h lower than the speedometer. > >Which one is right ? > >Wouldn't that affect the fuel consumption calculated by the computer as >well ? I had noticed the same thing on a 96 900SE that I drove x-country and back (don't ask). What we had found is that the SID was way off for avg speed from what was indicated. We double checked what our ODO indicated, did the math, and found that the SID was ~6mph below what our math showed. What we also found was the SID showed a lower incremental/total mileage driven vs the ODO. As for accuracy, according to drivers' watches (which were syncronized) the time check was done on the hour to reduce math errors (sleep deprivation is great) to only a few seconds. as for ODO, we never zeroed it, but recorded it at each fuel stop to allow driver to keep (better) track cruising distance. Total distance driven was ~4000 miles & we were really surprised at the lack of consistancy between SID & ODO. Of course, we expected a little, but what we found was surprising. I don't recall exact difference, but it was substantial. -ray 73 Porsche 914 1.7L (Car in a box) 80 BMW 323i 8? Buick/Opel Cadet (GT-4 SCCA) 85 Saab 900Turbo 91 VW Jetta GL "When the the going gets weird, the weird turn pro." -Hunter S. Thompson "There is no long way in a fast car." -Gene-Dog

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