I've spoken to my tuner, JJ@WMS and he said he can tailor a "roadtrip" tune for me in that it'll be down on power in the effort of getting mileage. I didn't hear this from JJ or even ask him if it's a good idea, but I remember someone mentioning they even went as far as removing the SC belt on roadtrips because even if you stayed out of boost, the belt is still spinning the SC. Once I get more tuning done I'll post my results of a street vs roadtrip tune, but I can say at the moment that my mixed commute of street/highway between work and back that I only get about 8mpg on a simple base tune.