Ferm, I got educated by a guy who had a 26 bertram with a single 225 opti, I told him it was probably a pig, he said it would run 42 mph before he put the tower and bottom painted it, after wards, it ran 37mph, he was able to cruise at 30mph , burning hardley any fuel. I called BS, he assured me that it would do it. I started researching it on line, found a mercruy boat house bullitin where a 26 was run with a pair of 150 V6 back in '76. The boat had a factory hardtop on it and ran close to 60. You figure the old 150's were close to 135(270 total) as rated today, combined with the weight of twins(around 700 lbs) compaired to a 225 Opti (closer to 240 hp), weight of a single (500 lbs), that performce claim of 42 doesn't seem to far off. I've ridden in a couple of 26 bertrams with 4.3 MPI's(220 hp each) that I saw 61 on the GPS at WOT. There are two of the 26's here locally that Cummins has been running, one with twin 1.6L Merc(Isuzu) 135 hp motors, and one with twin Merc(VM) 150 hp engines. Don't know the performance on them, but I know they have run the snot oout of them. I'd love to have a 26 with a pair of 225 Optis or 200 4 strokes