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You probably need a tune up. New plugs, plug wires, and possibly vacuum lines leaking. Also add a can of Seafoam or Techron fuel injector cleaner to a full tank of gas. I would also replace the fuel filter. A partially clogged fuel filter will cause a fuel pump to work harder and fail prematurely.

AnswerWinter can also reak havoc on your gas mileage, espically when you have a driver information center telling your MPG. Driving in snow puts more strain on the car, as does starting it to warm it up (car running burning gas but not going anywhere = lower average MPG displayed on the driver info center)
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Q: What should be checked first on my recently purchased second hand 1999 park avenue base model when I get poor mileage about 12 mpg after I checked the air filter brakes tire pressure?
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