fwiw, Lemmy actually supports both subscript and superscript, though the syntax is a little weird if you’re used to Reddit. ~text~ is subscript, ^text^ is superscript. (Unfortunately support on mobile clients—even Jerboa, made by the official Lemmy devs—is rather lacking.)
Ek=1/2mv^2^
But yeah, that’s a really good point. I wonder how long you’d have to be travelling at 60 km/h to make that extra acceleration worth it in terms of fuel efficiency.
As a separate question: people would probably often be willing to sacrifice their fuel efficiency if it meant substantially shorter travel times. I wonder how much this would actually work. On highways it’s definitely going to be a huge factor, but on the sorts of inner-city stroads that are usually posted at 60 km/h, I suspect you’ll probably arrive at most of the same red lights accelerating up to 40 km/h as someone getting all the way up to 60 would. Would be an interesting experiment to conduct.