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"So, I wonder if it is possible to build a 4 cylinder engine that could be manually switched from 2 cyl or 4 cyl. I know I got a 4 cyl vehicle that gets decent highway mpg, but it burns gas accelerating. I know I can't build an engine myself, but I just theorize that for a small car, this could be good."
I know the OEMs are looking into it. I suspect the holdup is excessive vibration in 2 cyl mode and an unwillingness to add enough flywheel to smooth it out.
"Another idea not related is to have the battery power the engine fan, not the engine like in cars I saw in the early 90's, except to have a switch to turn them off (when the car will just sit there or when you are working on it.)"
Ummmm... have you looked under the hood in the last 25 years? Pretty much all electric fans except pickups.
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