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change fuel price units to cents per litre

Discussion in 'Prius c Main Forum' started by Jake_just_Jake, Aug 21, 2017.

  1. Jake_just_Jake

    Jake_just_Jake New Member

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    I just purchased a 2016 PriusC and I love it.

    However I couldn't find a way to input the fuel price in the correct units.

    The only option is to input the price of fuel as dollars and cents per litre (ex: 1.25 $/L). This format makes sense for $/Gal, but in Canada fuel is priced in cents and tenths of a cent per litre (ex: 93.9 cents/L).

    I couldn't find a way to change this in the manual.
    Am I missing something?

    Thanks for the help
     
  2. Mendel Leisk

    Mendel Leisk Senior Member

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    With prices invariably something $1.29.9, why sweat that tenth of a cent: call it $1.30?
     
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  3. The Professor

    The Professor Senior Member

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    Similar issue here in the UK.

    The car asks for £ per imperial gallon, but petrol is priced here in £ per litre (even though we still use MPG, MPH, and Miles for all road/car related stuff).

    If you find a solution, do let me know.
     
    #3 The Professor, May 20, 2018
    Last edited: May 20, 2018
  4. Tideland Prius

    Tideland Prius Moderator of the North
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    Ditto. You're talking about a tenth of a cent. It's ok to round up.

    E.g. 129.9cents/litre is inputted as $1.30/litre in our car.
     
  5. davids45

    davids45 Active Member

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    G'day,

    Apropos of going much too far with this......
    ..does the car know how much fuel is left in the tank when you fill up and then proportionately average the price per unit liquid volume for its subsequent cost per unit distance or trip summary?

    Country driving here can see a significant price differential between city and country fuel cost.

    F'rinstance, city $1.30/L filled tank, drove a few hundred kms into the bush and (keeping the maths within my limited grasp) topped up with 18L at $1.40. Do I enter $1.35 or $1.40 when prompted by the car to enter a fuel fill cost?

    We haven't yet updated that old wise saying, 'Penny wise and pound foolish'.

    But still sounds like they're talking about me ;) .

    David S.
     
  6. Mendel Leisk

    Mendel Leisk Senior Member

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    MPG I care about, and for that I do a spreadsheet, because:

    1. The car is hopelelessly, chronically optimistic.
    2. Disconnect the 12 volt cable, and all is gone.

    Cost per liter doesn't interest me, I don't believe I even could enter it on our 2010, and even if I could, see number's 1 and 2 above.
     
  7. padroo

    padroo Senior Member

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    It a wonder someone in marketing doesn't want to change our US gas prices to price by the quart and people would think they are getting a deal. I would not surprise me if they did.
     
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    Here's a basic spreadsheet, to convert from US prices per gallon to CDN price per liter:

    upload_2018-5-20_20-0-46.png

    I could add British pound per imperial gallon conversion, or is gas sold by the liter??
     

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  9. The Professor

    The Professor Senior Member

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    Thanks. Here in the UK it's sold by pence per litre, e.g. 123.4p / litre. The car needs it in £ per Imperial gallon. So the conversion is PencePerLitre * 0.04546, i.e. £5.61.

    Pixel 2 ?
     
  10. Tideland Prius

    Tideland Prius Moderator of the North
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    I wonder if part of the optimism is due to E10 fuel. I mean, you pump 50 litres and you use the entire tank, you’d normally divide your distance by 50 litres but really you only used 45 litres of petrol and 5 litres of ethanol.
     
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  11. Mendel Leisk

    Mendel Leisk Senior Member

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    I've added a couple more functions: the first to convert UK pound cost per liter to US dollars per gallon, since that seems to be a common need, and the second to convert UK pound cost per liter to pound per imperial gallon, for entry in the UK cars. I used pounds, not pence, since the conversion is trivial: 100 pence per pound.

    upload_2018-5-21_6-55-1.png

    It's cumbersome, because I'm pretty thick: it'd be nice to be able to enter any of those values, and have all the others update. And perhaps utilize a web link, so that the shifting variables of dollars and pounds updated automatically.

    I'm just waiting, for someone to point me to the website where this has all been done, lol...
     

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  12. The Professor

    The Professor Senior Member

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    No on both counts. It does, however, know with reasonable accuracy how much fuel is being used. The computer uses the current unit price of the fuel that you've entered, and applies that to the fuel used.

    Sure, if you fill your tank from empty with cheap fuel, then top it up with a few drops later of very expensive fuel and update the computer to the expensive price, then drive for 500 miles, it'll apply that expensive price to the fuel you used for that entire 500 mile journey, even though all but a few drops were cheap.

    In reality though, we're creatures of habit. We generally fill up when the tank is at a given level, or on a particular day, or before a regular journey, or whatever, and it's usually from the same places. Over time, it'll be pretty close, just due to usage described here being dominant and averaging out pretty well.