Welcome to ZRoadster.org - BMW Z1 Z4 Z8 Z3 Forum and Technical Database

If you want to join in with the discussion, and see the areas which are available only to members then sign up now!

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Actual MPG v Trip computer

Discussion in 'Performance' started by Woody100, Dec 30, 2013.

  1. Woody100

    Woody100 Zorg Addict

    Joined:
    Apr 7, 2013
    Messages:
    266
    Likes Received:
    107
    Trophy Points:
    61
    Location:
    Chelmsford
    Model of Z:
    3.0
    Been getting about 32mpg according to the trip computer on the car and I wanted to see how accurate it actually was, so I filled up clocked up 190 miles over the week and then filled up again. Managed to get 36 litres in so my calculations of 190 miles used 8 gallons which ends up with a average MPG of 24 !!!

    I have been booting it around since fitting the new exhaust as I'm addicted to the noise it generates and I guess 24 SPG ( Smiles Per Gallon) is a true figure

    While 24 isn't great it's bloody god dam fun !!!

    Happy new year to you all.


    Sent from my iPad using Tapatalk
     
    • Like Like x 1
  2. bessieblue

    bessieblue Zorg Guru (II)
    East Anglian Crew

    Joined:
    Jan 13, 2012
    Messages:
    1,052
    Likes Received:
    345
    Trophy Points:
    120
    Location:
    chelmsford
    Model of Z:
    2.2
    Hi Woody was it a sports exhaust you fitted ,is this whats affecting the mileage ?. I dont think mines giving much better, but then i do hold the revs more
     
  3. Woody100

    Woody100 Zorg Addict

    Joined:
    Apr 7, 2013
    Messages:
    266
    Likes Received:
    107
    Trophy Points:
    61
    Location:
    Chelmsford
    Model of Z:
    3.0
    I'm not sure the exhaust has much to do with it Pete to be honest other than me keep putting my foot down to hear that growl from it !!

    I reckon if I keep foot off the gas pedal then I might get mid 30's but that's not as much fun !

    Just wondered why the trip computer was a fair bit out to the actual SMG ?
     
  4. GazHyde

    GazHyde The Gaz Monkey
    Staff Member Administrator Global Moderator British Zeds

    Joined:
    Dec 2, 2011
    Messages:
    15,226
    Likes Received:
    9,380
    Trophy Points:
    226
    Location:
    Newbury, Berkshire
    Model of Z:
    BMW Z4 3.0Si Sport
    Putting an induction kit and Eisenmann back box made no difference to the amount of fuel my 2.0 used - unless I was booting it ;)

    I find that my 2.2 is about 3 or so MPG optimistic.

    Most of the cars I've owned have been wildly optimistic when worked out 'real world'. The best was the 3.0i Z4 which was usually around +/- 1mpg against real world. The worst was my MINI Cooper Diesel which could be anywhere up to about +/- 8mpg out.
     
    • Like Like x 1
  5. Brian H

    Brian H Zorg Guru (V)
    British Zeds Scottish Zeds

    Joined:
    Dec 5, 2011
    Messages:
    3,531
    Likes Received:
    2,569
    Trophy Points:
    195
    Location:
    Killin
    Model of Z:
    E36/7 3.0i - E85 Z4///M
    If you find your mpg trip computer is not quite right you can adjust it to return the correct figures. I will try and look out the adjustment method, failing that there was a write up in the BMWCCGB mag recently by Mike Fishwick about the procedure.

    Happy new year BTW :)
     
    • Like Like x 1
  6. Woody100

    Woody100 Zorg Addict

    Joined:
    Apr 7, 2013
    Messages:
    266
    Likes Received:
    107
    Trophy Points:
    61
    Location:
    Chelmsford
    Model of Z:
    3.0
    Well I've filled it back up and going to drive like a Nun for the next couple of days and see how accurate it is at low speeds !

    Oh I love science !


    Sent from my iPad using Tapatalk
     
  7. Woody100

    Woody100 Zorg Addict

    Joined:
    Apr 7, 2013
    Messages:
    266
    Likes Received:
    107
    Trophy Points:
    61
    Location:
    Chelmsford
    Model of Z:
    3.0
    Bit confused with this old MPG malarky !!! Filled the car back up and drove like 96 yr old nun on a school run and still only managed a return of 25mpg !!

    So the moral of this story is drive how you want whenever you want where you want and I'm going to get an average of 24mpg. I can live with that !!

    Just glad I don't have to use the car for work !
     
    • Like Like x 1