there was a company here in aus that for a short time was selling efi LPG using conveted petrol injectors and injecting the lpg as a liquid it required very complicated corection maps due to presure changes from temp and a efi fuel pump int he lpg tank

however for all the trouble the cars that they converted actually produced more power due to the cold intake temps

so my dad and I have always wondered if you could use LPG as a form of intercooling

a small NOS jet squirting LPG instead of NOS into the intake track under boost as a extra fuel source

the -50 lpg temps should be great