[GretchenGotGrowl]

Typically what happens is that the hwy mpg goes up more than city with just turbos. I'm guessing this is more than just FI and a tune since you see a very big increase in the city mpg. I'm guessing they are combining the FI with DOD/AFM and tuning it so that the engine continures to run on fewer cylinders under greater load. They may also be using some hybrid tech here, too. Just a guess though.