The only thing that can catastrophically cause your gas mileage to drop from about 20 mpg to about 8 mpg is your O2 sensor.
This is the characteristic symptom of a bad O2 sensor.
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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