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Talked to a couple of guys that own the Z7. The 150 Optimax will run 69-73 trimmed out ect. I'm planning on buy the 2010 Z8 w/225, best price going for 20ft boat. Everyone I talked to says they are a good riding boat.
I recently ordered a new Z7 with a 200. From other owners, the 150 is in the low 60's. Some with 175's are seeing mid to high 60's and with a 200 they are a 68 to 74 mpg boat via GPS. The ride is a good ride for under 19 foot and the vast majority are very happy with their rigs. the 200 (or even 175) does not have to work as hard as the 150. there is some youtube vidoes of an owner testing fury props with his 200 opti. I think you can search fury and find it. Everyone says it is a pretty easy boat to drive, but will have a tendancy to walk a little with a 200 which is normally caused by overtrimming. Ride in one and look them over and you decide.