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Short of complete disassembly of the dash, I'm not sure you can. Unless the coffee gets into something electrical or on an actuator, not much harm will be done. Do all of the HVAC control functions still work?
I get about 15 MPG in my 97 but I have a V-8. A V-6 should get a bit better than that. The smell in your airvent could also be mold. It is nearly impossible to get smells out of the vents but you could always take it apart and clean it with bleach.
It could be a plain old fashioned leak around the windscreen - difficult to find but try sitting in the car while somebody plays a water hose over the windscreen.
It could also be a blocked drain in the ventilation system - fresh air is normally drawn in to a car via vents at the bottom of the windscreen. These vents normally lead to a "box" like structure where any water that enters the vents drops to the bottom and then drains away via a short hose that runs to somewhere underneath the car.
If the drain outlet or hose gets blocked (by leaves for example), it can cause the box to fill with water to the point where it can leak out in to the passenger area.