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I have an '88 Targa and I have about the same level of consumption (400 miles/qt) with no leaks. I have noticed that the consumption is greater if:
I operate at a constant speed (ie cruise control set at 75 mph or around 2800 - 3200 rpms) for an extended period (2 hours or more) of time.
The tank level is below 1/2. It seems to drop slowly to about 5/8 (say 250 miles)and then it really starts to go.
In addition, I have noticed that the #5 plug has a tendency to foul.
Any suggestions?
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