Outboard Model Choice

[RANCHI OTTO]

I have to do a choice concerning outboard engines for an high speed boat having following main characteristics:

Length hull = 12.0 m
Displacement fully loaded = 9600 kg

The basic version had 4 x 300 hp by Johnson now out of production

The choiche is btw.:

a) Mercury Verado 300 / 4 strokes
b) Mercury OptiMax 300 / 2 strokes
c) Suzuki DF 300 / 4 strokes
d) Yamaha Vmax 300 / 2 strokes (problems with antipollution regulations)
e) Evinrude 300 / 2 strokes (new model presented at Genova boat show this month)

The 2 strokes need 90 kg additional weight (oil to be mixed with gas + tank + piping)

What are your suggestions?

Important is weight & consumption....

Thanks