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Very little retooling could have next years car & truck engines running High Pressure Fuel Injection.

Developed over a half century ago & carefully shelved in favor of catalytic converters( a horror story in itself).

H P F I allows each fuel molecule to be completely surrounded by air for complete combustion (more bang for the buck), and no unburned fuel components that need a cat. to burn them after the fact.

For as long as we've had cat. converters all that wasted fuel burned in them could have been used to power our vehicles down the road( a 20~30% MPG improvement).

Just imagine if we had been able to use 20~30% less Towelhead juice since 1965!

Years ago, when I was a journalist, I interviewed a guy from the local community who claimed he had invented a carburetor that actually vaporized the fuel. Most carbs just atomize it -- reduce it to very fine droplets. So do fuel injectors. Liquid gasoline won't burn; it must first vaporize (shift states). That is an energy-intensive process, and reduces the amount of energy available for useful work.

A true vapor carburetor would provide far more energy per intake cycle than one that atomized fuel. The inventor claimed that the resulting explosion could not be contained by a gas engine's cylinder head. He was forced to tool a diesel engine head to keep the thing from blowing apart.

I was skeptical (that was back in the days when journalists were.) So I consulted a physics professor at the University of Colorado. He verified (in general terms) the results I had been given.

That sounds a lot like what you're describing.