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Old November 22nd, 2018, 07:56
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Tim_MN Tim_MN is offline
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Join Date: Mar 2003
Location: Minneapolis, MN
Posts: 7,115
Re: Sudden drop in fuel economy

A sudden drop of 30-40% in gas mpg's should make one suspect the O2 sensor circuit: fuses, wires, wire plugs, sensor faults.

Checking the thermostat and coolant temp sensor is also a good idea.
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