Yes, the powers that be would want to be the first to build one.
Im positive the big automakers COULD have come up a far more efficient means of propelling a car by now, but when everyone is obviously quite used to paying for fuel like they have been doing, why do something that would throw a wrench into the stream of cash?!
The automakers do not make more cash when people buy more gas. The oil companies do. Unless you believe both industries are controlled by the Illuminati or the Springfield Stonecutters, there is no reason to think automakers would risk someone else beating them to the market.
I have wondered why they havent looked deeper in fuel vaporizing, that seems to be how so many of these shadetree DIY’ers are able to get triple digit mpg.
It is easy to get triple digit MPG when powering a ultra-light vehicle at 25 miles per hour on a flat test track. The difficultly comes when you want to move a 2 ton minivan to soccer practice in a city with stop lights and hills. There are reasons why commercially available vehicles do not have such mileage, and it has nothing to do with conspiracies or incompetence.
Its the same reason none of them have a vehicle that will last a persons lifetime, I really believe by now car engines could have more solid state mechanics, but again, people are used to paying for repairs and eventually buying a new car. this ‘system’ keeps a lot of industries afloat.
Your inability to imagine reasons for why things are the way they are does not mean those reasons don’t exist. It means you need to look harder.