Fuel Gauge/Display Error

Anyone experiencing a problem with the fuel gauge? The gauge on my wife's TT Roadster (2002 w/ 6,500 miles) will not read more than 1/2 full, but is currently reading almost empty when the tank was filled less than 75 miles ago. Orange "low fuel" warning symbol displayed in information center, but computer readout shows 170 miles to empty.

I'll take it to the dealer later this week - but would appreciate any comments on similar experiences.

Thanks.