Excessive fuel consumption
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Thread: Excessive fuel consumption

  1. #1
    Greenhorn
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    Excessive fuel consumption

    Greetings All,
    I recently purchased a 2015 Si Coupe with 46k miles
    I noticed that my gas has been going down much faster than I feel it should be. I filled up a fill tank of 91 octane and the fuel economy shows that I have been driving at about 28 MPG and my commute to school is 22 miles total round trip. Just 2 days after I filled up, my gas is reading half a tank. I just want and idea of where the problem could be and if it is or isn’t normal.
    Thanks


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  3. #2
    Super Mod's Pet 12FG4Rallye's Avatar
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    Do you smell fuel at all at any point when the cars both running our even sitting not running.
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  4. #3
    Greenhorn
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    Excessive fuel consumption

    Quote Originally Posted by 12FG4Rallye View Post
    Do you smell fuel at all at any point when the cars both running our even sitting not running.
    No I don’t smell any fuel nor do I see any leaks on the floor


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  6. #4
    Nooblets
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    Has your driving style changed? Are you hitting more traffic? Those affect mpg the most. I found cruise control at 65 for all highway I can get 34 mpg hand calculated


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  7. #5
    Question Authority Roadcourse's Avatar
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    Try driving like there's an egg under the accelerator pedal. I get 33-34 in all town driving and can get 43 on all highway without trying too hard. The R18 is a great engine ; )
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  8. #6
    Truck? What truck?! scottyrocks's Avatar
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    Quote Originally Posted by ClassicRod View Post
    Greetings All,
    I recently purchased a 2015 Si Coupe with 46k miles
    I noticed that my gas has been going down much faster than I feel it should be. I filled up a fill tank of 91 octane and the fuel economy shows that I have been driving at about 28 MPG and my commute to school is 22 miles total round trip. Just 2 days after I filled up, my gas is reading half a tank. I just want and idea of where the problem could be and if it is or isn’t normal.
    Thanks
    Hello and welcome.

    You say you recently got the car, so you have limited basis for comparison?

    28 mpg is a reasonable figure for an Si. My R18 gets about that but my commute (33 miles each way) is a choker - a lot of heavy traffic - and then when it opens up I often hammer it until I get up to speed.

    If you want more mpg, try some of the suggestions mentioned above.
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  9. #7
    Big Timer!!! WrongWayWade's Avatar
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    Isn’t a 2015 Si equipped with the 2.4 liter K24 engine?
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  10. #8
    Greenhorn
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    Quote Originally Posted by WrongWayWade View Post
    Isn’t a 2015 Si equipped with the 2.4 liter K24 engine?
    Yes


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  11. #9
    Big Timer!!! homegrown's Avatar
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    Your fuel economy can vary depending on several factors, including traffic, temperature, and driver habits. 28mpg doesn’t sound unreasonable, but we would need more information. Check your tire pressure as that can make a big difference also.


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  12. #10
    Question Authority Roadcourse's Avatar
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    Quote Originally Posted by homegrown View Post
    Your fuel economy can vary depending on several factors, including traffic, temperature, and driver habits. 28mpg doesn’t sound unreasonable, but we would need more information. Check your tire pressure as that can make a big difference also.


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    He's right. 2# tire pressure difference makes a significance in my car, and is especially noticeable on a long highway trip.
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