Date: Fri, 30 Apr 2004 23:01:19 +0100
From: Colin Stamp <>
Subject: Re: Fuel consumption figures computer wrong

On Fri, 30 Apr 2004 22:12:46 +0100, David Taylor <> wrote: >> 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. What's wrong with resetting the computer when you fill up and comparing the reading with the pump reading at the next fill-up? If the OP was doing that, then the discrepancy of over 10% is very dissapointing. Colin.

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