Just me, but I would have liked to have seen two-stroke diesel cars. Who needs spark plugs or even valves, eh? Regulations like this are what killed the two-stroke Detroit Diesel engines in trucks, buses and even railroad locomotives.
I saw a video years ago where a diesel BMW, in Europe, got far better mileage than the driver of the Toyota Pious. The hybrid driver was sweating his tail off and the Beamer driver was cool, comfortable and still ahead. We could have that Beamer, but it’s against the law to import one here.