The type certificate here will give some info such as limit speeds and C of G.
http://www.airweb.faa.gov/regulatory...$FILE/A7ce.pdf
Some figures for the B model I picked up some where from a driver. No experience myself.
Cruise speeds, using 63% power settings were about 220 knots at FL230 and about 200 knots at FL180. Fuel flows were on average, block to block, about 245 pounds (41 gallons) per hour.