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My first thoughts would be to change the spark plugs, especially as you don't know their mileage.
I generally give my plugs 6000 miles, sometimes they go more if there are no problems.
There is often a definite "going off" around 6000 miles, similar to all the symptoms you describe but not quite so acute.
Plugs might account for some of the thirst if they are missing so many beats per 100? but that's not really running rich as such. I wonder if she's geared down from standard? That would account for the lower MPG unless of course this is a new thing?
Could also possibly be dirty injectors? If you have access to an ultra sound cleaner a quick blast in one of those should do the trick.
The electrical connection to my injectors failed prior to my buying it as a non-runner, and was fun detecting the fault, but once made good has been no trouble during my ownership.
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