Isn't this similar to the pogue carburettor?
The 100 MPG Carburetor Myth
When I was an apprentice, one of the tradesmen had a book with plans on how to use the exhaust through a heat exchanger to vaporize the fuel. The heat exchanger used a small motorbike carb and feed the vapor into a propane (LPG) carb on a Chevy V8.
From what I remember the theory was that fuel only burns as a vapor, no matter how small the droplets are the still have to vaporize to burn.
By pre-vaporizing you can run leaner and ensure closer to total fuel burn.
On a side note, would a modern Formula 1 car with 100Bar fuel pressure have a phase change when the fuel was injected?