Just purchased a 2008 306 Bimini with Yamaha F350's. Currently it has 15.5"x 21p Yamaha props.
5,600 max rpm's = 49 mph with 3/4 tank of fuel and 2 people and no gear
3,400 rpm's = 30 mph @ 1.5 mpg. Same load as above
With a full load I figure I'll drop to 5,400 max rpm's and should be...