I drove the 300 at the european launch in Sweden a week ago.
Really nice engine with the electronic remotes and startbutton etc etc.
I tested both single and twin but they wasnt fitted on any boat that helped me to check the difference of a 250.
It`s a 4,0 litre and they are talking about maximum 90 litre an hour on full revs.
One good thing is that the CC is the same as the 250 so if someone looking for upgrade a twin installation you dont need to make new holes in the transom, engine is only higher and wider.
I have a full spec in PDF so if someone interested i can mail it.