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@racprops, I doubt that head design would meet US EPA 2020 emissions requirements entirely on its own, but when these cars were sold in Europe and Japan (as late as 2006) they were entirely without a catalytic converter. They also have external EGR, lean out to as little as 24:1 AFR, and pull smoothly with wide open throttle as low as 800rpm (with a 3 cylinder).
I'm getting off into the weeds but the point I'm trying to make is, fuel vaporization is a non-issue for modern engines. That's already been figured out and solved. Honda had 100mpg conventional gasoline cars 20 years ago. It was low hanging fruit but has been picked, and manufacturers are looking elsewhere for gains now.
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