Surprise mpg for petrol E320

Discussion in 'General Discussion' started by forrester123, Jun 12, 2017.

  1. forrester123

    forrester123 Active Member

    Messages:
    69
    Joined:
    Mar 16, 2015
    Location:
    Cinderford
    Car:
    E 320
    Just got back from my hols. in Czech Republic, where I did about 2k.
    On the autobahn, I cruised at 90/100 mph where possible & the computer showed around 32 mpg, which was good.
    I found the most economical cruising speed was 80/85 mph where it showed 34mpg.
    Cruising around 70 only showed 30mpg on average.
    How accurate is the computer mpg?
    [The car is an 03 with 66k ]
     

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