About to join the ranks of Mobo'ers

Congratulations, great boat.

We have the Beneteau Antares 6.80 which is very similar with a Suzuki 115hp. You shouldn't have any problems doing 20knots, this is our normal cruising speed at roughly 4500rpm. Have had 30 knots+ with 5600rpm, clean bum and favourable tide but it wasn't comfortable and the fuel soon disappears, can go at 20knots all day and use approx 25L per hour.

Enjoy!
 
Well done, on my third mf.
my first was mf 625 with suzuki df115. She certainly did 28knt on gps in still calm water. 4 years later and the Bristol Channel has not offerred similar conditions since.......and the family prefer to go about half that speed.
enjoy,
 
I got my MF645 at this year's Southampton Boat Show. It also has the Yamaha 115HP.
I've had 29 knots out of her and she will cruise at 20-25 knots all day long. Mine is already approaching 70 hours since late October.

29 knots woohoo! The fastest any of my previous raggie boats has gone was 16 knots and that was considered very fast.
 
The only down side to the higher revs is that the cabin acts like a big amplifier and it can be a little noisy over 5000 rpm. However, the door is quite sound deadening when shut and the outboard noise surprisingly quieter in the cockpit.
 
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