• over_clox@lemmy.worldEnglish
    2·
    3 days ago

    There is no consolidated standard of unit of measure here, thanks for the AI slop.

    Petrol car has no watt-hour rating, the chart is already fucked.

    Edit: I see OP tweaked their AI prompt and delivered a watt-hour rating for petrol, which they must have pulled out of their ass.

    • Lvxferre [he/him]@mander.xyzEnglish
      1·
      3 days ago

      Edit: I see OP tweaked their AI prompt and delivered a watt-hour rating for petrol, which they must have pulled out of their ass.

      I redid the maths:

      • petrol heat of combustion should be 45~50MJ/kg, based on the the typical values for alkanes.
      • 1 MJ = 277 Wh
      • specific density of gasoline: 0.715~0.780 kg/L
      • fuel consumption seems to be 5~11 L/100km = 0.05~0.11 L / km
      • 1.61 km = 1 mile

      Plugging all this stuff together, you get (45~50 MJ/kg) * (0.715~0.780 kg/L) * (277 Wh/MJ) * (0.05~0.11 L/km) * (1.61 km / mile) = 717~1913 Wh/mile. The estimate in the site is 1000 Wh/mile; it sounds reasonable.

      • over_clox@lemmy.worldEnglish
        2·
        3 days ago

        Thanks for looking into it.

        Have you tried reloading the site? Shit changes, it doesn’t even have the number for petrol half the time…

        • Lvxferre [he/him]@mander.xyzEnglish
          1·
          3 days ago

          Yeah, the site coding was awful. Kind of expected from AI junk. However it seems to me like the data itself was actually researched, not “vibed”.

          • over_clox@lemmy.worldEnglish
            1·
            3 days ago

            Gotcha. Now there’s a catch to electric vehicles that’s almost always ignored…

            How much does a new EV battery pack cost when it wears out? About the same as a whole new vehicle.

            Petrol gas tanks don’t just up and wear out and require a $20K replacement every 5 to 10 years or so. Gas tanks are simple, they hold gas, that’s it.

            • Lvxferre [he/him]@mander.xyzEnglish
              2·
              3 days ago

              Yes. And, more important than that: EV batteries don’t just take energy to run, they take energy to manufacture. Usually you wouldn’t count the energy taken to produce a gas tank because it’s long-lasting, but if your battery lasts ~10y this amount of energy might be quite relevant — and probably is relevant due to the price.

              (This shows the “fuck cars” community is spot on, when it comes to EVs: they don’t solve the problem of the environmental impact behind cars, at most they alleviate it. An actual solution would be to design cities so people don’t need to use cars willy-nilly.)

              • over_clox@lemmy.worldEnglish
                2·
                3 days ago

                I miss my old horse Sissy, she was the best!

                Yeah they poop, but they’re also free lawnmowers…