I just picked up my new ´06 599 on Tuesday and already have about 1000 km on it. Taking it in for intial service on Friday already. What a sweet little ride. I´m getting about 230-250 kilometers (150 miles) on a tank of gas, and it costs me around $17 to fill (Canadian). So I think I´m getting around 14 kilometers for every litre of fuel. I have noticed that the gauge drops quickly when you get down to about 1/4 of a tank -- and there´s no reserve. It seems to be pretty consistent at around 230 kilometers before I start getting worried about finding a gas pump.