I just gave my recently purchased '98 S70 GLT w/ 84000 miles a tuneup (plugs, cap, rotor, fuel filter) and I am still getting terrible fuel economy (about 10-12 MPG city, not really driving fast). However there are no other problems with the way the car is running; performance seems OK, no rough idle, engine fires up instantly, and no service engine lights or any others lighting up. The only thing that I can tell might be wrong (other than the crappy mileage) is that the exhaust seems to have a strong gasoline odor (it's not the gas tank because I don't smell it when the engine isn't running) indicating, I guess, that something is causing a rich mixture. Does anyone know what would be doing this, how to remedy it, and how bad for my engine, catalytic converter or whatever running it in this condition is? Thanks. Steve