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Imperial units of measurement and the future?

Discussion in 'Heritage railways & Centres in the Uk' started by Railboy, Oct 17, 2017.

  1. Sawdust

    Sawdust Member

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    I'm really chuffed having changed car recently, mine now says over 800 miles when full. Reassuringly today I noticed it has done 400 miles on half a tank. It's not a small car either. (Note this has been doing in excess of 200 miles per day this week of mostly motorway driving and observing speed limits.)

    Sawdust.
     
  2. Jamessquared

    Jamessquared Resident of Nat Pres

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    Nothing to do with decimals: to get the same level of accuracy you just need to quote to the same number of significant figures. So for example, 55 mpg (2 significant figures) is 5.1 l/100km (2 significant figures); but if the decimal point offends, you could express it as 51 l/1000km and it has exactly the same meaning, in a decimal free zone ...

    Tom
     
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  3. ross

    ross New Member

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    Prejudice is a great time saver..
     
  4. MellishR

    MellishR Part of the furniture Friend

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    Apropos milk: AFAIK the situation is still (as it certainly was some years ago) that SI units (and a few others based on them) are legally required for many things in the UK but with some specific exceptions. Two of the exceptions are that milk can legally be sold in pints (rather than litres) if it is in bottles; and beer and cider can legally be sold in pints if they are on draft, i.e. not in bottles. I think it is technically illegal for a pub to sell lemonade or shandy by the pint but allowed in practice.
     
  5. RalphW

    RalphW Nat Pres stalwart Staff Member Administrator Friend

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    But you are changing the goalposts for the sake of your argument, who uses l/1000km?
     
  6. NeilL

    NeilL Active Member Friend

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    If I am driving in Europe and change the settings to KPH rather than MPH the consumtion figures are in l/100km and it all makes sense. It is even good to see the figure dropping.
     
  7. goldfish

    goldfish Resident of Nat Pres

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    You were arguing accuracy, not usage. It's you who's changing the goalposts.

    Simon
     
  8. RalphW

    RalphW Nat Pres stalwart Staff Member Administrator Friend

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    Can't see the logic in changing your readout just because you are driving in a different country. :confused:
     
  9. The Saggin' Dragon

    The Saggin' Dragon Nat Pres stalwart Staff Member Moderator Friend

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    Possibly to keep to the speed limits?
     
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  10. NeilL

    NeilL Active Member Friend

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    Certainly - with the French keen to fine on the spot a speedo reading in local currency saves doubt.
     
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  11. pmh_74

    pmh_74 Active Member

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    But you're all missing the point. For the fuel consumption to mean anything in the muddled-up UK it needs to be in litres/mile (or miles/litre) or some variant thereof. Which of course, means mixing up both systems.
     
  12. 30854

    30854 Well-Known Member

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    Absolutely.... and in any case, of all the factors affecting fuel consumption, none include what units the damned stuff is sold in!
     
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  13. Hirn

    Hirn New Member

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    As a wine bottle is three quarters of a litre and quite nearly one sixth of a modern gallon - that is since the 183os - I have used this as convenient
    intermediate to calculate between fills from petrol pumps in litres to miles per gallon, the odometer being in miles.

    Railway relevance: the change from 16 to 20 fluid ounces to the pint was due to Davies Gilbert who was asked byTrevithick: what would be the
    loss in power of a steam engine running without a condenser? Gilbert said: in principle, one atmosphere/ 15 psi ( as rebranded in our
    life times, one "bar"). This caught on thoroughly via Penydarren, "Catch Me Who Can", Puffing Billy, the Rocket etc. to the developed
    steam locomotive and traction engine. The notion that a unit of five pints would catch on because with 2o fluid ounces to the pint
    there would be 100 fluid ounces in it went nowhere. And quite right too: the future of calculation
    with computing has become binary.
     
    Last edited: Oct 21, 2017
  14. RalphW

    RalphW Nat Pres stalwart Staff Member Administrator Friend

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    No I'm not missing the point, we have successfully used mpg since motoring began, what would be the purpose of attempting to change to another system which, because it works the opposite way round, would cause more confusion. The fact that fuel is no longer sold in gallons is immaterial since it's very likely that most people either just fill up, or work to a price whatever country they are in.
     
  15. Sawdust

    Sawdust Member

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    The purpose of mpg figures is to compare vehicles, trips etc. against one another, so what fuel is sold in is irrelevant.

    Sawdust.
     
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  16. MellishR

    MellishR Part of the furniture Friend

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    If you use a spreadsheet (as I do) to keep track of your car's fuel consumption in mpg, you need to include a conversion factor for litres to gallons. But that is a one-off task when setting up the spreadsheet.
     

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