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regor -
I suspect the 9999 is not a problem per se. When you take your foot off the accelerator, your cars cut off fuel to the injectors. In this situation you have "infinite MPG" :
MPH / GPH = MPG => 50 MPH / 0 GPH => Infinity MPG
The Scangauge's don't have a symbol for infinity, so they display the largest number on a 4 digit display, 9999.
This could also be an artifact of the algorithms. For instance, if I were programming the scangauge, I would be watchful for divide-by-zero errors as displayed above. In that situation, I would probably divide by a super-teeny constant, say 0.0000001 GPH, which would yield "infinite MPG" for practical purposes :
50 MPH / 0.0000001 GPH = 500,000,000 MPG (aka infinite for comparison purposes)
Since my above example can yield "different infinities", they probably compromise and just display 9999 in all cases.
I saw this exact-same behavior on a Renault Megane diesel in Europe. I don't have fuel cutoff in my Saturn. You should be happy!!!!!!
In terms of the second problem, that's really whacky!
CarloSW2
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