This is really not very impressive.
The energy that is lost goes into the cooling system and out the exhaust. Unless they are recapturing that heat they are claiming to get more energy out of burning gasoline then we currently get out of burning gasoline. BTUs are BTUs, and there are only so many of them in gasoline. You can't heat it and burn some of the BTUs to increase the number of BTUs it has when burnt.
The all time record is 50%, and that is a huge 103rpm diesel engine.
This concept has been done over and over again and made people a lot of money, while giving absolutely zero improvement. It's a fake.
This just in: Presidents lie!