Sav - don't know about the 109, but your 155 figures are a wee bit off.
Can't be specific on the disposable load off the top of my head (but 2300kg seems a bit optimistic - maybe possible in a very light aircraft with virtually nothing installed in the way of extras), but she should easily cruise at 150kts plus at 50% MAUW and should be over 145 even at MAUW. As for fuel burn at MCP - about 315kg/h. That should be not too far away from you 460nm still-air to VFR reserves.
She's a great aircraft to fly!
OH