The turbocharged engine will get more energy out of the fuel it burns when compared to a similar output n/a engine. The turbo engine has a more fuel efficient cam profile in most cases.
However, dropping a turbo on an existing engine will not return better mileage on the street.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
