Originally Posted by SAM@GTM

Millage is related to how aggressive you drive you car, so for example if you are the type that like bouncing off the rev limiter all the time you MPG will be effected greatly. On the other hand if you can stay off the boost your gas millage will be the same or better. below is you factory ecu air fuel ratio target map as you can see the 14.7 cell is where the ecu will target that to get you the best MGP so it does not mater whether you have a twin turbo or a super charger kit the ecu does not care , You will still get a good MGP providing you drive the car decent most of the time and also providing your car is tuned correctly. So for a daily driver car you will be just fine .

Sam