There are schemes for using waste heat to put the fuel through a phase change before it is pulled into the cylinder. They can be effective from the standpoint of assuring that the incoming charge is in a condition to be fully combusted.......But modern fuel injectors atomize the fuel to a degree that there is not a lot of efficiency to be gained.
Smokey Yunick (RIP, of NASCAR fame) did some interesting work with what he called "Adiabatic" versions of gasoline motors. To a great degree, these ideas are related, as they both have to do with minimizing wasted heat energy. But the safe operating envelope tends to get rather small.
I think the success of direct injection engines superceded exploration of the phase change concept, since the gains in efficiency hold more promise...... And the concepts are not really compatible with each other.