As I recall:
I think i flew the slowest C206 in the country TAS = 110 kts
Most of the C210's i have flown TAS = 140 - 150 kts (have not flown in cold conditions)
Fuel Burn = 55 - 65 L/hr
Fuel Tanks = See flight manual (Around 336L)
BEW = 950kg?? C206, 1050 - 1150kg?? C210 (from memory - some had been slightly bent)
MTOW = 1636kg C206, 1724kg C210