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    Significant reduction in mpg

    Folks - I have noticed over the last 2-3 months that my 2001 325i is giving a much lower mpg than normal. During my regular commute I was able to get about 400-420 miles per tank, and am now getting 340-350 miles. Nothing has changed, same commute, traffic patterns, gas used, etc. I understand variations in driving conditions, but this seems like it happened overnight and never corrected. I am continuously getting 340-350 now. that is an approximately 15% delta and is big

    Any theories on how and why this can happen?

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    Please let us know what is your

    mileage on this car. Original owner? and what maintenance has been done on the emissions, air intake, MAS, O2 sensors, etc?
    Which trans do you have?

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    Re: Please let us know what is your

    90k miles, I am the original owner and hence can tell something aint right. Car gets routine annual maintanence as it always has. O2 sensors were replaced a while ago. There are no warning lights, etc.

    Thanks

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    Winter Gas

    I have a 2004 325i 5sp and I noticed the car going from a steady 30mpg to 27 last year. That's when someone mentioned they read that the formula that all gas stations use changes during the winter. Sure enough this winter it is the same 3mpg decrease. That may explain some of the loss your seeing.

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    I've heard of this, but is it really true?

    I have owned this car for many summers and winters but have never experieced this. If this was normal, wouldn't we have huge swings in gas prices in the summer and winter?

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    try these steps :

    switch to a different brand of gas

    use only 'Hi-Test" 91 or higher octane

    replace the gas filter

    replace the air filter

    how many miles have the spark plugs been in there ?

    have a fault code read-out by a BMW dealer


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    No. Urband legend type thing that's been around

    for years. I can assure you there's no truth to it.

    Joe

  8. #8
    jayb
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    Check for slow gas leak


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    How do I do that?


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    One aspect of this kind of a check could be to

    measure the fuel pressure with the engine off at the fuel rail Schraeder valve. Then let the car sit for hours and measure again to see if there is any bleed off.

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