The instant readout is useful at times to see what effect, for
instance, an incline or a head/tail wind are having on your fuel
consumption. But for journey-to-journey reference the average
consumption is most useful. Good trip computers offer a choice of
readout - my Saab 9000 had both instant like an OM4 LCD with the
average digitally displayed next to it. My current car gives a
choice of various readouts, but I keep it on average and zero it at
every fill-up.
In addition, I compare mine with every fill-up and if the difference
is more than about 2% against my trip computer (checked with 3 or 4
visits to the same pump) I normally avoid that petrol station. In
the UK suppliers are allowed up to 7 0iscrepancy between measured
supply and actual volume; some suppliers seem to set their pumps to
close to that discrepancy as a matter of course (others don't). I
rarely have a problem with petrol stations on the Continent; they all
seem to agree with my trip computer, within 2%...
Chris
At 12:17 -0800 06/02/03, Timpe, Jim wrote:
Those computers are doing instantaneous calculations, and may very well be
accurate at a particular point in time. I remember watching such devices
tell me I'm getting 70mpg while coasting down a long incline. Watch the
same computer when you get on it pulling away from rest... 1 or 2mpg.
-----Original Message-----
From: William Clark
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