My 2006 Forenza wagon has a problem with down shifting when going down a steep slope. When coasting, and it has to be steep for that, it will down shift at 45 mph and go back up at 50 mph. I even have to keep my foot on the gas while going down hill. It has been to service 4 times now. Reprogramed the computer, still does it. I do not get the same mileage as my girlfriend, who by the way has the same exact car, we bought them within 1 day of each other. I am waiting on a call from Suzuki to see what they can do. I am not looking forward to driving this car in the winter with the tranny acting up like this.
