What is your trip mpg on short drives? Gen 4

Discussion in 'Gen 4 Prius Fuel Economy' started by Higgins909, Sep 10, 2021.

  1. Higgins909

    Higgins909 Member

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    I want to ask about specific generations of Prii, so here I am again.

    So I have a 2010 Gen3 (163k at the time, 185k now) which I've picked up is notorious for bad mpg. I also figured my mpg trip meter reads +3 mpg. (At the time) I had about a 8 mile drive to and then from work 5 days a week. I pretty much got 38mpg, 42mpg being the best on my fuelly. I'm just wondering what other people get on drives like this.

    Thanks,
    Higgins909
     
  2. dbstoo

    dbstoo Active Member

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    On my old Gen 1 Prius I got terrible gas mileage around town because no matter where I went I started with 5 minutes of the engine idling at red lights, stop signs and school crossings. The engine always ran until it warmed up enough. By that time I was at my destination where it would sit for an our or so and cool back down.

    Fast forward 20 years, and my Prius Prime is just made for my situation. All my around town errands are run on electricity. I never have a 2,3 or even 10 mile drive where the engine fires up.
     
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  3. alanclarkeau

    alanclarkeau Senior Member

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    It's about averages. Short drives can be relatively meaningless. The shorter the trip, the worse.

    If I drive to the shop (1½km), sometimes it'll be 10l/100km there, and ZERO back. Other times, the reverse. To Mum's house, 7km can vary between 3.5l/100km and 5.6l/100km.

    But on a run to Church, it'll be about 3.9 - 4.2 every time, both ways.
     
  4. fuzzy1

    fuzzy1 Senior Member

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    My very crude rule of thumb is that a cold engine warmup cycle costs about the same of fuel as driving 2 miles on a fully warmed up engine. I started this rule on a non-hybrid vehicle, and still use in on my Prius.

    By this rule, your 8 mile drive from a cold engine is fuel equivalent to 10 miles from warm. So your 38 mpg on commutes should correspond to 47-48 mpg on much longer trips.

    This rule is coarse, and breaks down more on trips short enough to not fully warm the engine.
     
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  5. alanclarkeau

    alanclarkeau Senior Member

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    Yes - and it depends on whether you're starting with 2 bars of hybrid or 8.
     
  6. The Professor

    The Professor Senior Member

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    Also starting from cold has a huge impact... the lubricants are more viscous, the cabin needs to be heated or cooled to the set temperature, the engine will run until it's warmed up. All of this energy comes from originally from the fuel.

    For what it's worth, I do similar sized journeys every day with my kids, taking them the nursery and school, then picking them up again. I'm usually starting from cold each journey. I'm averaging around 55MPG according to the computer. 50 in colder months, 60 in warmer months. I can easily push that 10MPG higher if I driver more economically, but rush hour driving requires some "spirited" acceleration when pulling out at into tiny gaps at junctions / roundabouts.

    Also bear in mind a UK gallon is 1.2x a US gallon, but I'm not convinced that's actually accounted for in the software. If it is, those figures would be closer to 42US-MPG and 50US-MPG respectively.
     
  7. FuelMiser

    FuelMiser Senior Member

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    Sounds about right for short trips. The Gen 4 has a "diary" type of display that shows accumulated MPG on a daily basis. This value updates in real time so you can observe the lower MPGs upon starting out and watch it grow as the trip progresses.
     

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  8. MPGboss

    MPGboss Junior Member

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    40s, but also dependent on day temps that day. the hotter the day, the better my chances are at high 40 mpg short drives...
     
  9. douglasjre

    douglasjre Active Member

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    That's part of why my next new car will be a Prime
     
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