Really? Good luck saving your legs with a crash inside a pick up. A Smart cars safety cell (cabin), usually needs to be cut apart when at a wrecking yard as the crusher won't uhhh crush it. I still wouldn't own one though.
My van at 400k gets better mileage than it did at 40. Never had any type of injector cleaning, decarbonization, or hocus pocus.
Gas engines run clean these days. Some lament the days of points and carbs. Not me.