This device is sort of like the other gasoline vaporizers, however it is more or less safe to use in a car.... I think.
I'm using a fuel injector to squirt a micro amount of fuel on to an ultrasonic transducer and it vaporizes / atomizes instantly. This is just a prototype and it is uncertain if it will actually work in a car.
You can follow the progress of this experiment at the following websites.
http://forum.miata.net/vb/showthread.php?t=441727 this experiment starts on page 9 but you might want to read the whole thing.
you can also view it at http://grassrootsmotorsports.com/forum/build-projects-and-project-cars/1994-miata-mpg-project-b3-stealth-mk-ii/61007/page1/