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I gave examples because I knew I wouldn't be believed. "Pumping work" is real. It's the reason you're advocating smaller engines that can do the job more efficiently. It's one of the reasons that other variables aside, larger engines are less efficient at a given power level.
I'm underscoring the underlying principle behind what you suggest. However, as cited, there are difficulties/impossibilities to simply disabling cylinders on modern engines that weren't designed to do so. On a carbureted engine with no 02 sensors (gm used sensors and computers with carbs for awhile) there's going to be more to it than pulling pushrods or unplugging injectors.
Yes, and Harley engines aren't exactly considered smooth running either.
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