1) The new Forester was not out when I needed a new car, but it was planned to get worse gas mileage than the Rogue.
2) Fuel economy was what convinced me to get a Rogue. I average between 750 and 850 km per tank (my best is about 940 km on a single tank this summer). The best thing with the Rogue is that last winter, I never went above 9.5 l/100kms when I usually go above 10 (between 10 and 12) with my previous cars (Subaru Legacy and RAV4, both manual shift). I was happily surprised by that. I have a FWD.
3) I did not get a discount as it was one of the first on the road and I needed it fast.
4) Bose system quality seems to be just a name. It is basically as good (or as bad) as any other sound system. Don't get biased by the name.