I'm looking at my first 04' 8 with 65k miles 15.5k. It's fully loaded with the GT package and nav.

Does the car have any on-board type computer to view gas-mileage/tire pressures/range/ ect?
I know rotary has a bad rep because of the FD RX-7 but is that need to worry gone in this car?

I think thats it. Good deal?

 

Not mileage, but there is a TPMS to let you know when tyre pressure drops below the advised limit. The stock NAV system is by now somewhat dated; there are now much more capable, pocket sized NAV systems available that can be dash mounted.
Check the car's history. A good deal depends on how it was mantained, whether it's had all the recalls done and the latest flash, overall wear and condition- and price. Any warranty or 30-day-return guarantee offered?

One is always taking a chance with a 4-year-old used car with 65K on the odometer.