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Lincoln Mark VI
I finally got the engine running its best that it ever has. I bought the car in 1991 and have been trying to figure out what it needed. The diagnostic computers the mechanics used said everything was fine. Finally I ordered a $50 Oxygen Sensor and replaced it. I also put a true dual exhaust on the car. Both things improved the way the car runs 100%. I went from 12-15 MPG at best to the last tank of mixed city/hwy driving (mostly hwy) at 19.3 MPG. That's pretty decent for a 20 year old car with original everything and 127,000 miles on the clock!