by ...... on August 12th, 2009

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What could cause your gas mileage to drop in half suddenly?

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Answers. 15 helpful answers below.

  • by Account Closed on August 12th, 2009

    Account Closed

    a lower octane will do this

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  • by bagicide stayed 10 months too long on August 12th, 2009

    bagicide stayed 10 months too long

    A leaking gas tank or gas line would certainly do it. A bad crankshaft will do it too.

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  • by Robertd903 on August 12th, 2009

    Robertd903

    ...giving OPRAH a ride!!!

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  • by - M.C.S. - Dave on August 12th, 2009

    - M.C.S. - Dave

    The computer system in it. I had a old 84 ford pick-up that at first was giving me 20 to 24 miles per gallon. Then it started acting up & went to only giving about 4 mpg. By resetting the system, I got back my 20 + mpg. This is only one thing that can do it tho. There are many others items on today's cars/trucks that can cause the problem.

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  • by Thinker on August 12th, 2009

    Thinker

    There can be a number of reasons for this happening from dirty injectors to sparkplugs to a stopped cataletic converter or muffler.

    I could also be since you say it is a vette someone's foot is getting a little heavy!

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  • by Vanessa The Rose on August 12th, 2009

    Vanessa The Rose

    Honda civic or Toyota yaris?

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  • by scotty on August 12th, 2009

    scotty

    losing your insurence

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  • by 404 on August 12th, 2009

    404

    If your Honda Civic magically poofed into a Hummer.

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  • by eljh61354 on September 26th, 2009

    eljh61354

    Either a fuel leak, a clogged catalytic converter or muffler, or a bad oxygen sensor. Is the check engine light on?

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  • by stream12 on September 2nd, 2009

    stream12

    octane wont make that happen unless it had water in it and if it did you would notice a change in how the engine runs it has to be something else like exhaust leak or malfunctioning sensor ect.

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  • by Mavericks just doin a flyby on October 25th, 2009

    Mavericks just doin a flyby

    Driving around with your parking brake on!

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  • by DukeG on October 25th, 2009

    DukeG

    Crappy gasoline.
    a fouled spark plug.
    Clogged Air Filter.
    Dirty Injectors.

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  • by Sabrina on December 1st, 2009

    Sabrina

    I would go with vacuum leak. Is this an OBD II? Check fuel trims.

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  • by kybear on October 25th, 2009

    kybear

    The best way to figure it out is to start at the beginning and work from there. First, is the gas bad. Then it could be injectors, plugs, and any number of other things. Check your tire pressure too. Don't think that would cause it to be cut in half but it does have an effect.

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  • by Ashcat on December 17th, 2009

    Ashcat

    The tips in this article show ways to improve gas mileage..
    http://www.ehow.com/how_5736812_efficiently-improve-gas-mileage.html

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