Date: Fri, 30 Apr 2004 22:12:46 +0100
From: David Taylor <djtaylornospamoot.com>
Subject: Re: Fuel consumption figures computer wrong


> No, it is not. My Saab's computer gives mpg figures that are less than 1% > offset. then you're lucky or manage to drive identically every single time! I haven't reset mine in a couple of thousand miles and it says 31.2mpg. Of course that's averaged over that 2000 or so miles so if I now go and drive hard for half a tankful, i'd expect a much higher error than 1.5 litres per 100km. Similarly, resetting it for every journey (unless they are significant in distance )isn't accurate because you're filling a small amount for a small mileage and filling from a pump whose accuracy is unknown to you and could introduce errors and you can't be guaranteed of the click off point of the pump either. Like I said, either you're lucky or drive identically, either way, the display is a calculation which is averaged and therefore can't be taken as absolute. David.

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