Building A Fuel Efficient Jeep - Project Mileage Master, Part 1
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On that first drive, we got 6.8 mpg on the highway. With 197,000 miles on the motor, we thought maybe the engine or just the head gasket was blown; we got an Actron compression tester and found from 127 pounds to 150 pounds across the six cylinders. We replaced the O2 sensor and the mileage immediately jumped up to 16 mpg. View Related Article
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