The new standards are part of a broad push to get more Americans into electric vehicles, and reduce the environmental cost of driving.

  • BarqsHasBite@lemmy.ca
    link
    fedilink
    English
    arrow-up
    27
    ·
    edit-2
    5 months ago

    R&D, engineering, manufacturing process changes, supply chain changes (I think this pretty much requires hybrid) all the way from mining, etc takes time. The world can’t change on a dime.

      • BarqsHasBite@lemmy.ca
        link
        fedilink
        English
        arrow-up
        16
        arrow-down
        2
        ·
        5 months ago

        3 years is nothing for this kind of change. Things take way more time than you think.

          • BarqsHasBite@lemmy.ca
            link
            fedilink
            English
            arrow-up
            4
            ·
            edit-2
            5 months ago

            When a new car model with a new engine comes out, is it all at once? Why don’t they put out the new engine in bits and pieces? Not how it works.

            • boonhet@lemm.ee
              link
              fedilink
              arrow-up
              1
              ·
              5 months ago

              There’s plenty you can change to improve fuel economy without replacing the entire engine design.

              1. Fuel maps (potentially at the expense of power)

              2. Transmission shift maps (at the expense of acceleration)

              3. Lighter materials elsewhere in the car (this one actually is better for performance too!)

              4. Better stock tires

              5. Final drive ratio (again, sacrificing acceleration) or gearing in the transmission if necessary.

              Compromises will be have to be made for sure, but they can be spaced out so all the legwork doesn’t have to be done at once.

              Of course I didn’t even mention hybridization because that’s not a minor change, but some manufacturers might still opt for it and you could keep the same engine technically.

              • BarqsHasBite@lemmy.ca
                link
                fedilink
                English
                arrow-up
                2
                ·
                5 months ago

                Those are such small things. Not even sure you can do some because of the way mileage is calculated - pretty sure part of it is “accelerate from this speed to this speed in this time, so many times”.

                • boonhet@lemm.ee
                  link
                  fedilink
                  arrow-up
                  1
                  ·
                  5 months ago

                  Ah fair, some might have more effect in real life than tests.

                  Still, timing and fuel infection changes alone can change fuel economy by a lot without necessitating a new block or head design.

      • Ranvier@sopuli.xyz
        link
        fedilink
        arrow-up
        11
        ·
        edit-2
        5 months ago

        The rules, issued by the National Highway Traffic Safety Administration, call for improvements over a five-year span starting with 2027 models

        So they did exactly what you suggested. We also have current rules in place that are increasing fuel efficiency over time. It’s not just nothing and then meet this standard by 2031, it’s improving by 2% per year, every year, starting in 2027 (the beginning of the time period for the newest set of rules). The article posted is just very light on details. The article is just quoting where they would be at, in 2031, with those yearly goals. So current rules are that cars be at 55 mpg by 2027, and the new rules rate beginning that year, would be 56 in 2028 etc until at 61 mpg for cars in 2032 (and 45 mpg for light trucks)

        https://www.nhtsa.gov/press-releases/new-fuel-economy-standards-model-years-2027-2031

        https://www.nhtsa.gov/sites/nhtsa.gov/files/2024-06/CAFE-2027-2031-HDPUV-2030-2035_Final-Rule_web_0.pdf

        10% yearly increases for heavy trucks and vans as well.