My 90 20v is on it's third thermostat with me... The original one was stuck open, the next one (aftermarket) didn't last a week before it was stuck open, the most recent genuine Audi stat brings the temperature up to a qtr on the gauge. It heats up to halfway in town & drops again on the highway, so sounds much like your car.
I've still got both the main & aux radiators on my car, wondered if it was something to do with that?
I'm getting 29.1 mpg in a mix of mainly faster B-road driving & some town driving.
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Too many cars!!
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