Adding a turbo will give you worse gas mileage, not better. What makes you think it would improve it?
EDIT - I'm not watching your video, it's probably adware or a virus. STS went out of business three years ago because they were crap. And even if they were not, a turbocharged engine won't get better mileage than the same sized engine without a turbo, you can't increase power and MPG at the same time, one comes at the expense of the other. All of the new cars that have new more efficient turbo engines are more efficient because the turbo engine is significantly smaller in displacement than what it replaces, not the same size.