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  1. #1

    [OP] Junior Member


    Join Date
    Dec 1969
    Posts
    21

    Default MPG after 30,000

    My MPG seems to have jumped again. It might just be me but every 10,000 mile I see a jump in MPG. I wonder if the mixture is leaning out or this little 3 banger is getting looser with age.

  2. #2

    Junior Member


    Join Date
    Dec 1969
    Location
    Charlotte, NC
    Posts
    10
    I'm at 40K and have not seen a change since around 7K and you know how much I get around this past year. We'll see if there is a change after the 40K service.

  3. #3

    [OP] Junior Member


    Join Date
    Dec 1969
    Posts
    21
    It could be the mods I have made each year also.

  4. #4

    Junior Member


    Join Date
    Dec 1969
    Location
    Rochelle, IL
    Posts
    1
    could just be your driving habits have changed, your getting used to how it drives.

  5. #5

    [OP] Junior Member


    Join Date
    Dec 1969
    Posts
    21
    No, I drive it like I stole it every day.

  6. #6

    Junior Member


    Join Date
    Dec 1969
    Location
    Grass Valley, CA
    Posts
    1

  7. #7

    Junior Member


    Join Date
    Dec 1969
    Location
    Mesa, AZ
    Posts
    1
    I just turned 30K miles on my '08 and on the recent trip to Jam-On-The-Dam, I averaged 42.84 mpg from Mesa, to Kingman AZ.
    In traffic in Vegas and the Dam run my mileage was down to 33.46 mpg.
    And on the return trip Las Vegas to Kingman averaged 45.99 mpg.
    But Kingman back to Mesa had heavy traffic on Carefree highway, I-17, and Loop 101, so brought me back down to 35.16 mpg.

    But I have also noticed that my Smart gets better mileage at higher altitudes.
    5000 ft to 7400 ft elevation I can get 45 to 47 mpg. Same driving at 1500 to 2500 ft I get 38 to 42 mpg.
    What is strange is that I seem to be running rich at the lower elevation, but leaning out at hgiher elevation, which is contary to the air density.
    Maybe I have a faulty Manifold Air Pressure sensor?

  8. #8

    Junior Member


    Join Date
    Dec 1969
    Location
    Torrington, CT
    Posts
    1
    After changing the plugs at 34,000 miles, my in town went from 36 mpg too 38 mpg. My hwy miles went from 42 mpg to 46 mpg. I used the standard plugs from the dealer. My gap on the old plugs had increased by 10,000th of an inch.

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