I just got my first Mazda tonight and I'm going to tear into it tomorrow. On the 65 mile trip home I burned just over 4 gallons of gas[:@] . I have a 1998 Mazda B2500 with 230000 miles 4cyl/5spd. It runs great and never misses. It has plenty of power, just need to work on the gas mileage. So far all 8 plugs have been changed along with a coil pack and wires. What should I look at or test first? The O2 sensor?

Thanks,

Curtis

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