Decreasing mpg

Discussion in 'Gen 3 Prius Fuel Economy' started by Manhal K Alrashdan, Jun 8, 2016.

  1. Manhal K Alrashdan

    Manhal K Alrashdan Junior Member

    Joined:
    Aug 18, 2015
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    Location:
    jordan
    Vehicle:
    2010 Prius
    Model:
    V
    My 2010 prius had been giving low mpg since the last three months. It has now 145 K miles.when I bought it a year ago, it had 134K on it. I haven't changed the spark plugs, do they have any effect on low mpg? , my mpg is about 39 now,but was 42_45 before. Another question: what are the symptoms for the spark plugs to be changed?
     
  2. bwilson4web

    bwilson4web i3 and Prime

    Joined:
    Nov 25, 2005
    22,791
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    Location:
    Huntsville AL with 2014 BMW i3-REx
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Plus
    Going back to my 1966 VW MicroBus days: (1) hard starts on cold days, and (2) poor mileage.

    Assuming there are no deposits, it may only require adjusting the gaps. Be sure and use an anti-seize compound when putting them back in.

    Bob Wilson
     
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