Initial purchase cost is far lower for petrol, particularly on the bigger boats & what happens when the Govt is forced to give into the EU and levy full duty on diesel eh
Ok so I'd have a diesel too if I could afford it. Just trying to feel good about my position.
Having run both Optimax and HPDI (albeit only for a couple of weekends.) I can say that they are both a helluva lot more efficient than carbuerreted 2 strokes! Although my floscan has apparently given up the ghost when it was working on the 200HPDI I have now I was getting almost exactly 1 litre per knot until about 4/5's throttle when of course it all goes crazy. It is nice doing 51kts though even momentarily!
1 litre per mile is the rule of thumb I work too and then add +25% for safety in range calculations.
The Yam is certainly quieter than the Opti. At low speeds its almost like a 4 stroke!