I was told 65 all day, everyday.

I believe it my boat runs high 50's with the same engines and a lot more weight and wind drag. must get 3+ mpg going 50!

Are you guys forgetting about the big Magnum's with diesel out there

I've been looking at ads for them. What does yours have in it?

Mine has 1200hp MTU'S with #12 Arneson surface drives swinging 32"- 6 bladed S & S props. cruises at about 50. Not bad for a boat that weigh's 56k lbs

I'm looking to up the HP to twin 1550's if I can find the right pair

That's awesome. When did they switch from Detroit 2 strokes?

MTU'S were an upgrade option on the Magnum's back then. I contacted Magnum when I got the boat and they sent me the original build sheet, pictures and spec on the boat.

I have built a couple of spor boats with Diesels both are running Cummins engines the 48 has the 6.7 liter 550HP with the Trimax drive and runs in the low 80s also built a 43 with 8.3 liter 600HP for a military test boat that runs in the low 70s weighing in at around 20k lbs. also with the Trimax Drive.[ATTACH=CONFIG]550235[/ATTACH] You can go on the Team Scarab website Larry has a bunch of pictures on there

If someone is looking to repower their boat to diesel?

Have a look, looks like a cheap way to get started

http://phoenix.craigslist.org/wvl/boa/5393774120.html