Ok firstly you cannot recalibrate the saw, without restoring the factory defaults, which you cannot do.
2. Everything on the saw is the same as any other saw save for the AT feature.
3. When you say it load up about a minute at idle.......please explain....are the rpms climbing? is the clutch engaging? Is this consist or a one time thing......etc...
4. tank of fuel in 10-15min................the 555 sips fuel
Take it to your dealer and ger the error codes read......based upon the symptoms, especially the high fuel consumption, I would be leaning towards an air leak or the air valve not closing properly at idle or...............
Its under warranty and I am sure any dealer would luv to hook up to it and read whats going on, its a learning curves for the techs as it is the customers.