I get easily 200 miles on a tank with the DT300i as I did with the original that was stolen and it had about 20000 miles on the odometer. OK, that's 320 km/tank with reserve. Look for a station at 300 km until you get a feeling for it.
Karl
PS: You probably already took your trip! I am always a day late, dollar short and off topic! TAN, it will be a cold day in a hot place before I yield to the berm. I will pull over and stop for a tailgater but won't ride to the right to let them pass. Few know where the right hand side of their car is anyway. Bet you don't either!