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Hank©[_3_]

On 6/17/2013 11:01 PM, wrote:
On Mon, 17 Jun 2013 21:15:42 -0400, "F.O.A.D." wrote:

I was thinking that someone might have changed the gearing on the
odometer for some reason, but my auto mechanical knowledge is so skimpy
and so dated I am sure there is no connection anymore between the
odometer and the drive train.

I suppose there might still be a car with a mechanical speedometer but
most use tach pulses.

These days changing that reading is usually changing tires and/or
wheels.
I imagine if the engine computer was swapped out it might not be for
that car too.

I would start with that measured mile thing, preferably a bunch of
then since you can't really trust the signs on the interstate.
You also want to average the gas over a number of tanks.

When I did the GPH on my boat I did it over 100+ hours of running.

That will give you an average GPH. Not very accurate for predicting your
usage for a day of running hard or for a day of trolling or poking
around the shoreline or inland waters. In one case you will use
multiples of your average GPH. In the other case you will be using
somewhat less than your average.
In the case of the Saturn, one of the displays yields an accurate
reading but the others don't compute. My guess is that the computer
software went hooky falooky. My first response might be to reload the
software and then replace the speedo control module if that didn't solve
the problem.