I run my Legacy in Sport for around town and sport # for cruse control (i-sight) on the Motorway or when i need to get away from the lights a bit quicker. I use to just run in Sport, but found sport # giving me smother uphill acceleration. Economy is about the same. Didn't buy the Legacy turbo for its fuel economy :-)
I love I-sight. It took a while to get use the the car stopping and starting without me doing anything, be hard to live without it now.