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How fix 1991 Lumina apv gas usage 150000 miles V6 31L did 400 miles tankful suddenly became 250 miles had tuneup plugs ignition wires air cleaner O2 sensor tires steering timing Ok runs starts well?

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2007-08-02 00:48:30
2007-08-02 00:48:30

Has the type of driving the vehicle is doing changed between the 400 miles/tank and the 250 miles/tank results? For example, if you go from substantially averaging say 35-40 miles per hour, to spending a lot of time stopped in traffic, your mileage will drastically reduce. Is the mileage better if you do a longish highway trip? Have the brakes recently been fixed - if so, are they binding? To check, take the vehicle for a 10-mile drive on the highway where you don't have to brake. Get off at a rest stop and try to slow using transmission. Get out, check the brakes to see if one or more is really hot. If it is, it is probably binding. Alternatively, have your mechanic put the vehicle on a hoist to see if the wheels are rolling freely. Might also be a bad wheel bearing - although you would likely hear that grinding. Hope that helps.

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