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My scangauge reads 9999 when coasting from high speed, like going down a hill at highway speed with no throttle. At idle, if I remember correctly, there is nothing displayed next to mpg.
The fuel cutoff switch in my 22RE is located in the AFM. When the throttle is let off and the airplate inside snaps closed due to lack of vacuum, it hits a switch that turns the fuel pump off. This is sometimes a source of problems of the fuel pump not working properly due to lack of power.
I'm sure the early 1FZs are exactly the same way. Not sure about the '95 plus ones like mine that don't AFMs. It's probably all digitally controlled instead of the manual trip switches like the earlier models.
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